Picoscale structural insight into superconductivity of monolayer FeSe/SrTiO 3

doi:https://doi.org/10.1126/sciadv.aay4517

Title: Picoscale structural insight into superconductivity of monolayer FeSe/SrTiO ₃

Abstract

Remarkable enhancement of the superconducting transition temperature ( T _c) has been observed for monolayer (ML) FeSe films grown on SrTiO ₃ substrates. The atomic-scale structure of the FeSe/SrTiO ₃ interface is an important determinant of both the magnetic and interfacial electron-phonon interactions and is a key ingredient to understanding its high- T _c superconductivity. We resolve the atomic-scale structure of the FeSe/SrTiO ₃ interface through a complementary analysis of scanning transmission electron microscopy and in situ surface x-ray diffraction. We find that the interface is more strongly bonded for a particular registration, which leads to a coherently strained ML. We also determine structural parameters, such as the distance between ML FeSe and the oxide, Se–Fe–Se bond angles, layer-resolved distances between Fe–Se, and registry of the FeSe lattice relative to the oxide. This picoscale structure determination provides an explicit structural framework and constraint for theoretical approaches addressing the high- T _c mechanism in FeSe/SrTiO ₃.

Authors:

^[1];

^[2];

^[3]; Albright, Stephen D. ^[4];

^[5];

^[4];

^[1];

^[3];

^[2];

^[6]

Yale Univ., New Haven, CT (United States). Dept. of Applied Physics; Yale Univ., New Haven, CT (United States). Center for Research on interface Structures and Phenomena; Fudan Univ., Shanghai (China). Lab of Advanced Materials
Yale Univ., New Haven, CT (United States). Dept. of Applied Physics; Yale Univ., New Haven, CT (United States). Center for Research on interface Structures and Phenomena
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
Yale Univ., New Haven, CT (United States). Center for Research on interface Structures and Phenomena; Yale Univ., New Haven, CT (United States). Dept. of Physics
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Yale Univ., New Haven, CT (United States). Dept. of Applied Physics; Yale Univ., New Haven, CT (United States). Center for Research on interface Structures and Phenomena; Yale Univ., New Haven, CT (United States). Dept. of Physics; Yale Univ., New Haven, CT (United States). Dept. of Mechanical Engineering and Materials Science

Publication Date:: 2020-04-01

Research Org.:: Argonne National Lab. (ANL), Argonne, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES); US Air Force Office of Scientific Research (AFOSR)

OSTI Identifier:: 1626043

Alternate Identifier(s):: OSTI ID: 1631021; OSTI ID: 1671310

Report Number(s):: BNL-215942-2020-JAAM
Journal ID: ISSN 2375-2548

Grant/Contract Number:: AC02-06CH11357; SC0012704; FA9550-15-1-0472

Resource Type:: Journal Article: Accepted Manuscript

Journal Name:: Science Advances

Additional Journal Information:: Journal Volume: 6; Journal Issue: 15; Journal ID: ISSN 2375-2548

Publisher:: AAAS

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats


                    Peng, Rui, Zou, Ke, Han, M. G., Albright, Stephen D., Hong, Hawoong, Lau, Claudia, Xu, H. C., Zhu, Yimei, Walker, F. J., and Ahn, C. H. Picoscale structural insight into superconductivity of monolayer FeSe/SrTiO 3.  United States: N. p., 2020. 
        Web.  doi:10.1126/sciadv.aay4517.

Copy to clipboard


                    Peng, Rui, Zou, Ke, Han, M. G., Albright, Stephen D., Hong, Hawoong, Lau, Claudia, Xu, H. C., Zhu, Yimei, Walker, F. J., & Ahn, C. H. Picoscale structural insight into superconductivity of monolayer FeSe/SrTiO 3.  United States.  https://doi.org/10.1126/sciadv.aay4517

Copy to clipboard


                    Peng, Rui, Zou, Ke, Han, M. G., Albright, Stephen D., Hong, Hawoong, Lau, Claudia, Xu, H. C., Zhu, Yimei, Walker, F. J., and Ahn, C. H. Wed .  
        "Picoscale structural insight into superconductivity of monolayer FeSe/SrTiO 3".  United States.  https://doi.org/10.1126/sciadv.aay4517.  https://www.osti.gov/servlets/purl/1626043.

Copy to clipboard


                    
@article{osti_1626043,

  title        = {Picoscale structural insight into superconductivity of monolayer FeSe/SrTiO 3},

  author       = {Peng, Rui and Zou, Ke and Han, M. G. and Albright, Stephen D. and Hong, Hawoong and Lau, Claudia and Xu, H. C. and Zhu, Yimei and Walker, F. J. and Ahn, C. H.},

  abstractNote = {Remarkable enhancement of the superconducting transition temperature (Tc) has been observed for monolayer (ML) FeSe films grown on SrTiO3 substrates. The atomic-scale structure of the FeSe/SrTiO3 interface is an important determinant of both the magnetic and interfacial electron-phonon interactions and is a key ingredient to understanding its high-Tc superconductivity. We resolve the atomic-scale structure of the FeSe/SrTiO3 interface through a complementary analysis of scanning transmission electron microscopy and in situ surface x-ray diffraction. We find that the interface is more strongly bonded for a particular registration, which leads to a coherently strained ML. We also determine structural parameters, such as the distance between ML FeSe and the oxide, Se–Fe–Se bond angles, layer-resolved distances between Fe–Se, and registry of the FeSe lattice relative to the oxide. This picoscale structure determination provides an explicit structural framework and constraint for theoretical approaches addressing the high-Tc mechanism in FeSe/SrTiO3.},

  doi          = {10.1126/sciadv.aay4517},

  url          = {https://www.osti.gov/biblio/1626043},
  journal      = {Science Advances},

  issn         = {2375-2548},

  number       = 15,

  volume       = 6,

  place        = {United States},

  year         = {2020},

  month        = {4}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

Accepted Manuscript (DOE)

Publisher's Version of Record

https://doi.org/10.1126/sciadv.aay4517

Other availability

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Works referenced in this record:

Picoscale materials engineering
journal, September 2017

Ismail-Beigi, Sohrab; Walker, Frederick J.; Disa, Ankit S.
Nature Reviews Materials, Vol. 2, Issue 11
https://doi.org/10.1038/natrevmats.2017.60

Molecular beam epitaxy growth and post-growth annealing of FeSe films on SrTiO ₃ : a scanning tunneling microscopy study
journal, May 2014

Li, Zhi; Peng, Jun-Ping; Zhang, Hui-Min
Journal of Physics: Condensed Matter, Vol. 26, Issue 26
https://doi.org/10.1088/0953-8984/26/26/265002

High-temperature superconductivity in potassium-coated multilayer FeSe thin films
journal, June 2015

Miyata, Y.; Nakayama, K.; Sugawara, K.
Nature Materials, Vol. 14, Issue 8
https://doi.org/10.1038/nmat4302

Surface Structures of SrTiO ₃ (001): A TiO ₂ -rich Reconstruction with a c(4 × 2) Unit Cell
journal, August 2003

Erdman, Natasha; Warschkow, Oliver; Asta, Mark
Journal of the American Chemical Society, Vol. 125, Issue 33
https://doi.org/10.1021/ja034933h

What makes the Tc of monolayer FeSe on SrTiO3 so high: a sign-problem-free quantum Monte Carlo study
journal, June 2016

Li, Zi-Xiang; Wang, Fa; Yao, Hong
Science Bulletin, Vol. 61, Issue 12
https://doi.org/10.1007/s11434-016-1087-x

A unifying phase diagram with correlation-driven superconductor-to-insulator transition for the $122^{☆}$ series of iron chalcogenides
journal, February 2016

Niu, X. H.; Chen, S. D.; Jiang, J.
Physical Review B, Vol. 93, Issue 5
https://doi.org/10.1103/PhysRevB.93.054516

Surface structure of $Sr Ti O_{3} (001)$
journal, November 2007

Herger, R.; Willmott, P. R.; Bunk, O.
Physical Review B, Vol. 76, Issue 19
https://doi.org/10.1103/PhysRevB.76.195435

Discerning interface atomistic structure by phase contrast in STEM: The equilibrated Ni-YSZ interface
journal, August 2018

Nahor, Hadar; Kauffmann, Yaron; Lazar, Sorin
Acta Materialia, Vol. 154
https://doi.org/10.1016/j.actamat.2018.05.011

Superconductivity above 100 K in single-layer FeSe films on doped SrTiO3
journal, November 2014

Ge, Jian-Feng; Liu, Zhi-Long; Liu, Canhua
Nature Materials, Vol. 14, Issue 3
https://doi.org/10.1038/nmat4153

Ab initio study of cross-interface electron-phonon couplings in FeSe thin films on ${SrTiO}_{3}$ and ${BaTiO}_{3}$
journal, April 2016

Wang, Y.; Linscheid, A.; Berlijn, T.
Physical Review B, Vol. 93, Issue 13
https://doi.org/10.1103/PhysRevB.93.134513

Interface-Induced High-Temperature Superconductivity in Single Unit-Cell FeSe Films on SrTiO ₃
journal, March 2012

Wang, Qing-Yan; Li, Zhi; Zhang, Wen-Hao
Chinese Physics Letters, Vol. 29, Issue 3
https://doi.org/10.1088/0256-307X/29/3/037402

Origin of charge transfer and enhanced electron–phonon coupling in single unit-cell FeSe films on SrTiO3
journal, August 2017

Zhang, Huimin; Zhang, Ding; Lu, Xiaowei
Nature Communications, Vol. 8, Issue 1
https://doi.org/10.1038/s41467-017-00281-5

Onset of the Meissner effect at 65 K in FeSe thin film grown on Nb-doped SrTiO 3 substrate
journal, July 2015

Zhang, Zuocheng; Wang, Yi-Hua; Song, Qi
Science Bulletin, Vol. 60, Issue 14
https://doi.org/10.1007/s11434-015-0842-8

Phase diagram and electronic indication of high-temperature superconductivity at 65 K in single-layer FeSe films
journal, May 2013

He, Shaolong; He, Junfeng; Zhang, Wenhao
Nature Materials, Vol. 12, Issue 7
https://doi.org/10.1038/nmat3648

Electron ptychographic microscopy for three-dimensional imaging
journal, July 2017

Gao, Si; Wang, Peng; Zhang, Fucai
Nature Communications, Vol. 8, Issue 1
https://doi.org/10.1038/s41467-017-00150-1

Interfacial mode coupling as the origin of the enhancement of Tc in FeSe films on SrTiO3
journal, November 2014

Lee, J. J.; Schmitt, F. T.; Moore, R. G.
Nature, Vol. 515, Issue 7526
https://doi.org/10.1038/nature13894

Enhanced superconductivity due to forward scattering in FeSe thin films on SrTiO ₃ substrates
journal, February 2016

Rademaker, Louk; Wang, Yan; Berlijn, Tom
New Journal of Physics, Vol. 18, Issue 2
https://doi.org/10.1088/1367-2630/18/2/022001

Evidence of cooperative effect on the enhanced superconducting transition temperature at the FeSe/SrTiO3 interface
journal, February 2019

Song, Q.; Yu, T. L.; Lou, X.
Nature Communications, Vol. 10, Issue 1
https://doi.org/10.1038/s41467-019-08560-z

Anomalous correlation effects and unique phase diagram of electron-doped FeSe revealed by photoemission spectroscopy
journal, March 2016

Wen, C. H. P.; Xu, H. C.; Chen, C.
Nature Communications, Vol. 7, Issue 1
https://doi.org/10.1038/ncomms10840

Surface of Strontium Titanate
journal, February 2007

Herger, R.; Willmott, P. R.; Bunk, O.
Physical Review Letters, Vol. 98, Issue 7
https://doi.org/10.1103/PhysRevLett.98.076102

Effect of Structural Parameters on Superconductivity in Fluorine-Free LnFeAsO _{1- y} (Ln = La, Nd)
journal, August 2008

Lee, Chul-Ho; Iyo, Akira; Eisaki, Hiroshi
Journal of the Physical Society of Japan, Vol. 77, Issue 8
https://doi.org/10.1143/JPSJ.77.083704

Electron Phonon Coupling versus Photoelectron Energy Loss at the Origin of Replica Bands in Photoemission of FeSe on SrTiO 3
journal, June 2018

Li, Fengmiao; Sawatzky, George A.
Physical Review Letters, Vol. 120, Issue 23
https://doi.org/10.1103/PhysRevLett.120.237001

The structure of SrTiO ₃ (001)-2 × 1 surface analyzed by high-resolution medium energy ion scattering coupled with ab initio calculations
journal, June 2013

Matsuda, Taishi; Yoshida, Yuki; Mitsuhara, Kei
The Journal of Chemical Physics, Vol. 138, Issue 24
https://doi.org/10.1063/1.4811485

Interfacial effects on the spin density wave in FeSe/SrTiO $_{3}$ thin films
journal, January 2014

Cao, Hai-Yuan; Tan, Shiyong; Xiang, Hongjun
Physical Review B, Vol. 89, Issue 1
https://doi.org/10.1103/PhysRevB.89.014501

Superconductivity in the PbO-type structure -FeSe
journal, September 2008

Hsu, F. -C.; Luo, J. -Y.; Yeh, K. -W.
Proceedings of the National Academy of Sciences, Vol. 105, Issue 38
https://doi.org/10.1073/pnas.0807325105

Evolution of High-Temperature Superconductivity from a Low- $T_{c}$ Phase Tuned by Carrier Concentration in FeSe Thin Flakes
journal, February 2016

Lei, B.; Cui, J. H.; Xiang, Z. J.
Physical Review Letters, Vol. 116, Issue 7
https://doi.org/10.1103/PhysRevLett.116.077002

Enhanced Superconducting State in $FeSe / {SrTiO}_{3}$ by a Dynamic Interfacial Polaron Mechanism
journal, February 2019

Zhang, Shuyuan; Wei, Tong; Guan, Jiaqi
Physical Review Letters, Vol. 122, Issue 6
https://doi.org/10.1103/PhysRevLett.122.066802

The electron–phonon interaction with forward scattering peak is dominant in high T _c superconductors of FeSe films on ${{\rm{SrTiO}}}_{3}$ (TiO ₂ )
journal, January 2017

Kulić, M. L.; Dolgov, O. V.
New Journal of Physics, Vol. 19, Issue 1
https://doi.org/10.1088/1367-2630/19/1/013020

Oxygen vacancy modulated superconductivity in monolayer FeSe on $SrTi O_{3 - δ}$
journal, December 2019

Gong, Guanming; Yang, Haohao; Zhang, Qinghua
Physical Review B, Vol. 100, Issue 22
https://doi.org/10.1103/PhysRevB.100.224504

Pressure-induced high- $T_{c}$ superconducting phase in FeSe: Correlation between anion height and $T_{c}$
journal, May 2010

Okabe, H.; Takeshita, N.; Horigane, K.
Physical Review B, Vol. 81, Issue 20
https://doi.org/10.1103/PhysRevB.81.205119

Visualization of Dopant Oxygen Atoms in a Bi ₂ Sr ₂ CaCu ₂ O ₈₊ _δ Superconductor
journal, September 2019

Song, Dongsheng; Zhang, Xuefeng; Lian, Chaosheng
Advanced Functional Materials, Vol. 29, Issue 45
https://doi.org/10.1002/adfm.201903843

A new frontier for superconductivity
journal, November 2014

Bozovic, Ivan; Ahn, Charles
Nature Physics, Vol. 10, Issue 12
https://doi.org/10.1038/nphys3177

Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides
journal, September 2011

Yin, Z. P.; Haule, K.; Kotliar, G.
Nature Materials, Vol. 10, Issue 12
https://doi.org/10.1038/nmat3120

Phase contrast STEM for thin samples: Integrated differential phase contrast
journal, January 2016

Lazić, Ivan; Bosch, Eric G. T.; Lazar, Sorin
Ultramicroscopy, Vol. 160
https://doi.org/10.1016/j.ultramic.2015.10.011

Asymmetrically optimized structure in a high- T _c single unit-cell FeSe superconductor
journal, December 2018

Fukaya, Yuki; Zhou, Guanyu; Zheng, Fawei
Journal of Physics: Condensed Matter, Vol. 31, Issue 5
https://doi.org/10.1088/1361-648X/aaf2d9

Direct Observation of High-Temperature Superconductivity in One-Unit-Cell FeSe Films
journal, January 2014

Zhang, Wen-Hao; Sun, Yi; Zhang, Jin-Song
Chinese Physics Letters, Vol. 31, Issue 1
https://doi.org/10.1088/0256-307X/31/1/017401

Tuning the band structure and superconductivity in single-layer FeSe by interface engineering
journal, September 2014

Peng, R.; Xu, H. C.; Tan, S. Y.
Nature Communications, Vol. 5, Issue 1
https://doi.org/10.1038/ncomms6044

Direct imaging of electron transfer and its influence on superconducting pairing at FeSe/SrTiO ₃ interface
journal, March 2018

Zhao, Weiwei; Li, Mingda; Chang, Cui-Zu
Science Advances, Vol. 4, Issue 3
https://doi.org/10.1126/sciadv.aao2682

Reflection high-energy electron diffraction study on the SrTiO3 surface structure
journal, August 1994

Naito, Michio; Sato, Hisashi
Physica C: Superconductivity, Vol. 229, Issue 1-2
https://doi.org/10.1016/0921-4534(94)90805-2

Plain s-wave superconductivity in single-layer FeSe on SrTiO3 probed by scanning tunnelling microscopy
journal, August 2015

Fan, Q.; Zhang, W. H.; Liu, X.
Nature Physics, Vol. 11, Issue 11
https://doi.org/10.1038/nphys3450

What makes the T _c of FeSe/SrTiO ₃ so high?
journal, November 2015

Lee, Dung-Hai
Chinese Physics B, Vol. 24, Issue 11
https://doi.org/10.1088/1674-1056/24/11/117405

Direct evidence of superconductivity and determination of the superfluid density in buried ultrathin FeSe grown on ${SrTiO}_{3}$
journal, May 2018

Biswas, P. K.; Salman, Z.; Song, Q.
Physical Review B, Vol. 97, Issue 17
https://doi.org/10.1103/PhysRevB.97.174509

Role of double $Ti O_{2}$ layers at the interface of FeSe/ $SrTi O_{3}$ superconductors
journal, May 2016

Zou, Ke; Mandal, Subhasish; Albright, Stephen D.
Physical Review B, Vol. 93, Issue 18
https://doi.org/10.1103/PhysRevB.93.180506

Electron ptychography of 2D materials to deep sub-ångström resolution
journal, July 2018

Jiang, Yi; Chen, Zhen; Han, Yimo
Nature, Vol. 559, Issue 7714
https://doi.org/10.1038/s41586-018-0298-5

Atomically resolved FeSe/SrTiO ₃ (001) interface structure by scanning transmission electron microscopy
journal, March 2016

Li, Fangsen; Zhang, Qinghua; Tang, Chenjia
2D Materials, Vol. 3, Issue 2
https://doi.org/10.1088/2053-1583/3/2/024002

SrTiO3() surface structures under oxidizing conditions
journal, February 2003

Erdman, N.; Marks, L. D.
Surface Science, Vol. 526, Issue 1-2
https://doi.org/10.1016/S0039-6028(02)02573-6

Charge transfer and electron-phonon coupling in monolayer FeSe on Nb-doped ${SrTiO}_{3}$
journal, June 2016

Zhou, Yuanjun; Millis, Andrew J.
Physical Review B, Vol. 93, Issue 22
https://doi.org/10.1103/PhysRevB.93.224506

Phase contrast scanning transmission electron microscopy imaging of light and heavy atoms at the limit of contrast and resolution
journal, February 2018

Yücelen, Emrah; Lazić, Ivan; Bosch, Eric G. T.
Scientific Reports, Vol. 8, Issue 1
https://doi.org/10.1038/s41598-018-20377-2

Surface phase, morphology, and charge distribution transitions on vacuum and ambient annealed $SrTi O_{3}$ (100)
journal, May 2016

Dagdeviren, Omur E.; Simon, Georg H.; Zou, Ke
Physical Review B, Vol. 93, Issue 19
https://doi.org/10.1103/PhysRevB.93.195303

Vacant-Site Octahedral Tilings on ${SrTiO}_{3}$ (001), the $(\sqrt{13} \times \sqrt{13}) R 33.7 °$ Surface, and Related Structures
journal, April 2011

Kienzle, D. M.; Becerra-Toledo, A. E.; Marks, L. D.
Physical Review Letters, Vol. 106, Issue 17
https://doi.org/10.1103/PhysRevLett.106.176102

Large electron–phonon interactions from FeSe phonons in a monolayer
journal, July 2015

Coh, Sinisa; Cohen, Marvin L.; Louie, Steven G.
New Journal of Physics, Vol. 17, Issue 7
https://doi.org/10.1088/1367-2630/17/7/073027

Similar records in OSTI.GOV collections:

Direct imaging of electron transfer and its influence on superconducting pairing at FeSe/SrTiO ₃ interface

Journal Article Zhao, Weiwei ; Li, Mingda ; Chang, Cui -Zu ; ... - Science Advances

The exact mechanism responsible for the significant enhancement of the superconducting transition temperature (T _c) of monolayer iron selenide (FeSe) films on SrTiO ₃ (STO) over that of bulk FeSe is an open issue. We present the results of a coordinated study of electrical transport, low temperature electron energy-loss spectroscopy (EELS), and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) measurements on FeSe/STO films of different thicknesses. HAADF-STEM imaging together with EELS mapping across the FeSe/STO interface shows direct evidence of electrons transferred from STO to the FeSe layer. The transferred electrons were found to accumulate within the first twomore »« less
Cited by 9
https://doi.org/10.1126/sciadv.aao2682

Full Text Available
Electron-phonon coupling enhanced by the FeSe/SrTiO{sub 3} interface

Journal Article Li, B. ; College of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023 ; Xing, Z. W., E-mail: zwxing@nju.edu.cn ; ... - Journal of Applied Physics

The electronic structure, phonon dispersions, and electron-phonon (EP) coupling in Fe{sub 2}Se{sub 2}/SrTiO{sub 3} (FeSe/STO) thinnest films are studied based on the first-principles calculations. It is found that the FeSe/STO interface with lattice strain leads to a change of band structures and a significant enhancement of the EP coupling, the latter being close related to interface-induced ferroelectric phonons coupled to electrons on the FeSe monolayer. In the FeSe/STO system, T{sub c} of phonon-induced superconductivity is estimated to be much greater than that in the bulk FeSe, but still well below the experimental value of an FeSe monolayer on the STOmore »« less
https://doi.org/10.1063/1.4876750
Atomic and electronic structures of single-layer FeSe on SrTiO ₃(001): The role of oxygen deficiency

Journal Article Bang, Junhyeok ; Li, Zhi ; Sun, Y. Y. ; ... - Physical Review. B, Condensed Matter and Materials Physics

Using first-principles calculation, we propose an interface structure for single triple-layer FeSe on the SrTiO ₃(001) surface, a high-T _c superconductor found recently. The key component of this structure is the oxygen deficiency on the top layer of the SrTiO ₃ substrate, as a result of Se etching used in preparing the high-T _c samples. The O vacancies strongly bind the FeSe triple layer to the substrate giving rise to a (2×1) reconstruction, as observed by scanning tunneling microscopy. The enhanced binding correlates to the significant increase of T _c observed in experiment. The O vacancies also serve as themore »« less
Cited by 45
https://doi.org/10.1103/PhysRevB.87.220503
What makes the T _c of monolayer FeSe on SrTiO ₃ so high: a sign-problem-free quantum Monte Carlo study

Journal Article Li, Zi-Xiang ; Wang, Fa ; Yao, Hong ; ... - Science Bulletin

Monolayer FeSe films grown on SrTiO ₃ (STO) substrate show superconducting gap-opening temperatures (T _c) which are almost an order of magnitude higher than those of the bulk FeSe and are highest among all known Fe-based superconductors. Angle-resolved photoemission spectroscopy observed “replica bands” suggesting the importance of the interaction between FeSe electrons and STO phonons. These facts rejuvenated the quest for T _c enhancement mechanisms in iron-based, especially iron-chalcogenide, superconductors. Here, we perform the first numerically-exact sign-problem-free quantum Monte Carlo simulations to iron-based superconductors. We (1) study the electronic pairing mechanism intrinsic to heavily electron doped FeSe films, and (2)more »« less
Cited by 55
https://doi.org/10.1007/s11434-016-1087-x

Full Text Available
Thickness-dependent coherent phonon frequency in ultrathin FeSe/SrTiO ₃ films

Journal Article Yang, Shuolong ; Sobota, Jonathan A. ; Leuenberger, Dominik ; ... - Nano Letters

Ultrathin FeSe films grown on SrTiO ₃ substrates are a recent milestone in atomic material engineering due to their important role in understanding unconventional superconductivity in Fe-based materials. By using femtosecond time- and angle-resolved photoelectron spectroscopy, we study phonon frequencies in ultrathin FeSe/SrTiO ₃ films grown by molecular beam epitaxy. After optical excitation, we observe periodic modulations of the photoelectron spectrum as a function of pump–probe delay for 1-unit-cell, 3-unit-cell, and 60-unit-cell thick FeSe films. The frequencies of the coherent intensity oscillations increase from 5.00 ± 0.02 to 5.25 ± 0.02 THz with increasing film thickness. By comparing with previousmore »« less
https://doi.org/10.1021/acs.nanolett.5b01274

Full Text Available

Similar Records

Title: Picoscale structural insight into superconductivity of monolayer FeSe/SrTiO 3

Abstract

Citation Formats

Picoscale materials engineering journal, September 2017

Molecular beam epitaxy growth and post-growth annealing of FeSe films on SrTiO 3 : a scanning tunneling microscopy study journal, May 2014

High-temperature superconductivity in potassium-coated multilayer FeSe thin films journal, June 2015

Surface Structures of SrTiO 3 (001): A TiO 2 -rich Reconstruction with a c(4 × 2) Unit Cell journal, August 2003

What makes the Tc of monolayer FeSe on SrTiO3 so high: a sign-problem-free quantum Monte Carlo study journal, June 2016

A unifying phase diagram with correlation-driven superconductor-to-insulator transition for the 122 ☆ series of iron chalcogenides journal, February 2016

Surface structure of Sr Ti O 3 ( 001 ) journal, November 2007

Discerning interface atomistic structure by phase contrast in STEM: The equilibrated Ni-YSZ interface journal, August 2018

Superconductivity above 100 K in single-layer FeSe films on doped SrTiO3 journal, November 2014

Ab initio study of cross-interface electron-phonon couplings in FeSe thin films on SrTiO 3 and BaTiO 3 journal, April 2016

Interface-Induced High-Temperature Superconductivity in Single Unit-Cell FeSe Films on SrTiO 3 journal, March 2012

Origin of charge transfer and enhanced electron–phonon coupling in single unit-cell FeSe films on SrTiO3 journal, August 2017

Onset of the Meissner effect at 65 K in FeSe thin film grown on Nb-doped SrTiO 3 substrate journal, July 2015

Phase diagram and electronic indication of high-temperature superconductivity at 65 K in single-layer FeSe films journal, May 2013

Electron ptychographic microscopy for three-dimensional imaging journal, July 2017

Interfacial mode coupling as the origin of the enhancement of Tc in FeSe films on SrTiO3 journal, November 2014

Enhanced superconductivity due to forward scattering in FeSe thin films on SrTiO 3 substrates journal, February 2016

Evidence of cooperative effect on the enhanced superconducting transition temperature at the FeSe/SrTiO3 interface journal, February 2019

Anomalous correlation effects and unique phase diagram of electron-doped FeSe revealed by photoemission spectroscopy journal, March 2016

Surface of Strontium Titanate journal, February 2007

Effect of Structural Parameters on Superconductivity in Fluorine-Free LnFeAsO 1- y (Ln = La, Nd) journal, August 2008

Electron Phonon Coupling versus Photoelectron Energy Loss at the Origin of Replica Bands in Photoemission of FeSe on SrTiO 3 journal, June 2018

The structure of SrTiO 3 (001)-2 × 1 surface analyzed by high-resolution medium energy ion scattering coupled with ab initio calculations journal, June 2013

Interfacial effects on the spin density wave in FeSe/SrTiO 3 thin films journal, January 2014

Superconductivity in the PbO-type structure -FeSe journal, September 2008

Evolution of High-Temperature Superconductivity from a Low- T c Phase Tuned by Carrier Concentration in FeSe Thin Flakes journal, February 2016

Enhanced Superconducting State in FeSe / SrTiO 3 by a Dynamic Interfacial Polaron Mechanism journal, February 2019

The electron–phonon interaction with forward scattering peak is dominant in high T c superconductors of FeSe films on ${{\rm{SrTiO}}}_{3}$ (TiO 2 ) journal, January 2017

Oxygen vacancy modulated superconductivity in monolayer FeSe on SrTi O 3 − δ journal, December 2019

Pressure-induced high- T c superconducting phase in FeSe: Correlation between anion height and T c journal, May 2010

Visualization of Dopant Oxygen Atoms in a Bi 2 Sr 2 CaCu 2 O 8+ δ Superconductor journal, September 2019

A new frontier for superconductivity journal, November 2014

Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides journal, September 2011

Phase contrast STEM for thin samples: Integrated differential phase contrast journal, January 2016

Asymmetrically optimized structure in a high- T c single unit-cell FeSe superconductor journal, December 2018

Direct Observation of High-Temperature Superconductivity in One-Unit-Cell FeSe Films journal, January 2014

Tuning the band structure and superconductivity in single-layer FeSe by interface engineering journal, September 2014

Direct imaging of electron transfer and its influence on superconducting pairing at FeSe/SrTiO 3 interface journal, March 2018

Reflection high-energy electron diffraction study on the SrTiO3 surface structure journal, August 1994

Plain s-wave superconductivity in single-layer FeSe on SrTiO3 probed by scanning tunnelling microscopy journal, August 2015

What makes the T c of FeSe/SrTiO 3 so high? journal, November 2015

Direct evidence of superconductivity and determination of the superfluid density in buried ultrathin FeSe grown on SrTiO 3 journal, May 2018

Role of double Ti O 2 layers at the interface of FeSe/ SrTi O 3 superconductors journal, May 2016

Electron ptychography of 2D materials to deep sub-ångström resolution journal, July 2018

Atomically resolved FeSe/SrTiO 3 (001) interface structure by scanning transmission electron microscopy journal, March 2016

SrTiO3() surface structures under oxidizing conditions journal, February 2003

Charge transfer and electron-phonon coupling in monolayer FeSe on Nb-doped SrTiO 3 journal, June 2016

Phase contrast scanning transmission electron microscopy imaging of light and heavy atoms at the limit of contrast and resolution journal, February 2018

Surface phase, morphology, and charge distribution transitions on vacuum and ambient annealed SrTi O 3 (100) journal, May 2016

Vacant-Site Octahedral Tilings on SrTiO 3 (001), the ( 13 × 13 ) R 33.7 ° Surface, and Related Structures journal, April 2011

Large electron–phonon interactions from FeSe phonons in a monolayer journal, July 2015

Title: Picoscale structural insight into superconductivity of monolayer FeSe/SrTiO ₃

Picoscale materials engineering
journal, September 2017

Molecular beam epitaxy growth and post-growth annealing of FeSe films on SrTiO ₃ : a scanning tunneling microscopy study
journal, May 2014

High-temperature superconductivity in potassium-coated multilayer FeSe thin films
journal, June 2015

Surface Structures of SrTiO ₃ (001): A TiO ₂ -rich Reconstruction with a c(4 × 2) Unit Cell
journal, August 2003

What makes the Tc of monolayer FeSe on SrTiO3 so high: a sign-problem-free quantum Monte Carlo study
journal, June 2016

A unifying phase diagram with correlation-driven superconductor-to-insulator transition for the $122^{☆}$ series of iron chalcogenides
journal, February 2016

Surface structure of $Sr Ti O_{3} (001)$
journal, November 2007

Discerning interface atomistic structure by phase contrast in STEM: The equilibrated Ni-YSZ interface
journal, August 2018

Superconductivity above 100 K in single-layer FeSe films on doped SrTiO3
journal, November 2014

Ab initio study of cross-interface electron-phonon couplings in FeSe thin films on ${SrTiO}_{3}$ and ${BaTiO}_{3}$
journal, April 2016

Interface-Induced High-Temperature Superconductivity in Single Unit-Cell FeSe Films on SrTiO ₃
journal, March 2012

Origin of charge transfer and enhanced electron–phonon coupling in single unit-cell FeSe films on SrTiO3
journal, August 2017

Onset of the Meissner effect at 65 K in FeSe thin film grown on Nb-doped SrTiO 3 substrate
journal, July 2015

Phase diagram and electronic indication of high-temperature superconductivity at 65 K in single-layer FeSe films
journal, May 2013

Electron ptychographic microscopy for three-dimensional imaging
journal, July 2017

Interfacial mode coupling as the origin of the enhancement of Tc in FeSe films on SrTiO3
journal, November 2014

Enhanced superconductivity due to forward scattering in FeSe thin films on SrTiO ₃ substrates
journal, February 2016

Evidence of cooperative effect on the enhanced superconducting transition temperature at the FeSe/SrTiO3 interface
journal, February 2019

Anomalous correlation effects and unique phase diagram of electron-doped FeSe revealed by photoemission spectroscopy
journal, March 2016

Surface of Strontium Titanate
journal, February 2007

Effect of Structural Parameters on Superconductivity in Fluorine-Free LnFeAsO _{1- y} (Ln = La, Nd)
journal, August 2008

Electron Phonon Coupling versus Photoelectron Energy Loss at the Origin of Replica Bands in Photoemission of FeSe on SrTiO 3
journal, June 2018

The structure of SrTiO ₃ (001)-2 × 1 surface analyzed by high-resolution medium energy ion scattering coupled with ab initio calculations
journal, June 2013

Interfacial effects on the spin density wave in FeSe/SrTiO $_{3}$ thin films
journal, January 2014

Superconductivity in the PbO-type structure -FeSe
journal, September 2008

Evolution of High-Temperature Superconductivity from a Low- $T_{c}$ Phase Tuned by Carrier Concentration in FeSe Thin Flakes
journal, February 2016

Enhanced Superconducting State in $FeSe / {SrTiO}_{3}$ by a Dynamic Interfacial Polaron Mechanism
journal, February 2019

The electron–phonon interaction with forward scattering peak is dominant in high T _c superconductors of FeSe films on ${{\rm{SrTiO}}}_{3}$ (TiO ₂ )
journal, January 2017

Oxygen vacancy modulated superconductivity in monolayer FeSe on $SrTi O_{3 - δ}$
journal, December 2019

Pressure-induced high- $T_{c}$ superconducting phase in FeSe: Correlation between anion height and $T_{c}$
journal, May 2010

Visualization of Dopant Oxygen Atoms in a Bi ₂ Sr ₂ CaCu ₂ O ₈₊ _δ Superconductor
journal, September 2019

A new frontier for superconductivity
journal, November 2014

Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides
journal, September 2011

Phase contrast STEM for thin samples: Integrated differential phase contrast
journal, January 2016

Asymmetrically optimized structure in a high- T _c single unit-cell FeSe superconductor
journal, December 2018

Direct Observation of High-Temperature Superconductivity in One-Unit-Cell FeSe Films
journal, January 2014

Tuning the band structure and superconductivity in single-layer FeSe by interface engineering
journal, September 2014

Direct imaging of electron transfer and its influence on superconducting pairing at FeSe/SrTiO ₃ interface
journal, March 2018

Reflection high-energy electron diffraction study on the SrTiO3 surface structure
journal, August 1994

Plain s-wave superconductivity in single-layer FeSe on SrTiO3 probed by scanning tunnelling microscopy
journal, August 2015

What makes the T _c of FeSe/SrTiO ₃ so high?
journal, November 2015

Direct evidence of superconductivity and determination of the superfluid density in buried ultrathin FeSe grown on ${SrTiO}_{3}$
journal, May 2018

Role of double $Ti O_{2}$ layers at the interface of FeSe/ $SrTi O_{3}$ superconductors
journal, May 2016

Electron ptychography of 2D materials to deep sub-ångström resolution
journal, July 2018

Atomically resolved FeSe/SrTiO ₃ (001) interface structure by scanning transmission electron microscopy
journal, March 2016

SrTiO3() surface structures under oxidizing conditions
journal, February 2003

Charge transfer and electron-phonon coupling in monolayer FeSe on Nb-doped ${SrTiO}_{3}$
journal, June 2016

Phase contrast scanning transmission electron microscopy imaging of light and heavy atoms at the limit of contrast and resolution
journal, February 2018

Surface phase, morphology, and charge distribution transitions on vacuum and ambient annealed $SrTi O_{3}$ (100)
journal, May 2016

Vacant-Site Octahedral Tilings on ${SrTiO}_{3}$ (001), the $(\sqrt{13} \times \sqrt{13}) R 33.7 °$ Surface, and Related Structures
journal, April 2011

Large electron–phonon interactions from FeSe phonons in a monolayer
journal, July 2015