Superconductivity below 20 K in heavily electron-doped surface layer of FeSe bulk crystal

Seo, J. J.; Kim, B. Y.; Kim, B. S.; Jeong, J. K.; Ok, J. M.; Kim, Jun Sung; Denlinger, J. D.; Mo, S. -K.; Kim, C.; Kim, Y. K.

doi:10.1038/ncomms11116

Title: Superconductivity below 20 K in heavily electron-doped surface layer of FeSe bulk crystal

Abstract

A superconducting transition temperature (T _c ) as high as 100 K was recently discovered in one monolayer FeSe grown on SrTiO ₃ . The discovery ignited efforts to identify the mechanism for the markedly enhanced T _c from its bulk value of 8 K. There are two main views about the origin of the T _c enhancement: interfacial effects and/or excess electrons with strong electron correlation. Here, we report the observation of superconductivity below 20 K in surface electron-doped bulk FeSe. The doped surface layer possesses all the key spectroscopic aspects of the monolayer FeSe on SrTiO ₃ . Without interfacial effects, the surface layer state has a moderate T _c of 20 K with a smaller gap opening of 4.2 meV. Our results show that excess electrons with strong correlation cannot induce the maximum T _c , which in turn reveals the need for interfacial effects to achieve the highest T c in one monolayer FeSe on SrTiO ₃ .

Authors:

Seo, J. J. ^[1]; Kim, B. Y. ^[2]; Kim, B. S. ^[3]; Jeong, J. K. ^[4]; Ok, J. M. ^[5]; Kim, Jun Sung ^[5]; Denlinger, J. D. ^[6]; Mo, S. -K. ^[6]; Kim, C. ^[3]; Kim, Y. K. ^[7]

Yonsei Univ., Seoul (Korea). Inst. of Physics and Applied Physics; Inst. for Basic Science, Seoul (Korea). Center for Correlated Electron Systems
Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
Inst. for Basic Science, Seoul (Korea). Center for Correlated Electron Systems; Seoul National Univ. (Korea, Republic of). Dept. of Physics and Astronomy
Yonsei Univ., Seoul (Korea). Inst. of Physics and Applied Physics
Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of). Dept. of Physics
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
Inst. for Basic Science, Seoul (Korea). Center for Correlated Electron Systems; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source; Seoul National Univ. (Korea, Republic of). Dept. of Physics and Astronomy

Publication Date:: Wed Apr 06 00:00:00 EDT 2016

Research Org.:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1379279

Grant/Contract Number:: AC02-05CH11231

Resource Type:: Accepted Manuscript

Journal Name:: Nature Communications

Additional Journal Information:: Journal Volume: 7; Journal ID: ISSN 2041-1723

Publisher:: Nature Publishing Group

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; electronic properties and materials; superconducting properties and materials

Citation Formats


                    Seo, J. J., Kim, B. Y., Kim, B. S., Jeong, J. K., Ok, J. M., Kim, Jun Sung, Denlinger, J. D., Mo, S. -K., Kim, C., and Kim, Y. K. Superconductivity below 20 K in heavily electron-doped surface layer of FeSe bulk crystal.  United States: N. p., 2016. 
Web.  doi:10.1038/ncomms11116.

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                    Seo, J. J., Kim, B. Y., Kim, B. S., Jeong, J. K., Ok, J. M., Kim, Jun Sung, Denlinger, J. D., Mo, S. -K., Kim, C., & Kim, Y. K. Superconductivity below 20 K in heavily electron-doped surface layer of FeSe bulk crystal.  United States.  https://doi.org/10.1038/ncomms11116

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                    Seo, J. J., Kim, B. Y., Kim, B. S., Jeong, J. K., Ok, J. M., Kim, Jun Sung, Denlinger, J. D., Mo, S. -K., Kim, C., and Kim, Y. K. Wed .  
"Superconductivity below 20 K in heavily electron-doped surface layer of FeSe bulk crystal".  United States.  https://doi.org/10.1038/ncomms11116.  https://www.osti.gov/servlets/purl/1379279.

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@article{osti_1379279,

  title        = {Superconductivity below 20 K in heavily electron-doped surface layer of FeSe bulk crystal},

  author       = {Seo, J. J. and Kim, B. Y. and Kim, B. S. and Jeong, J. K. and Ok, J. M. and Kim, Jun Sung and Denlinger, J. D. and Mo, S. -K. and Kim, C. and Kim, Y. K.},

  abstractNote = {A superconducting transition temperature (T c ) as high as 100 K was recently discovered in one monolayer FeSe grown on SrTiO 3 . The discovery ignited efforts to identify the mechanism for the markedly enhanced T c from its bulk value of 8 K. There are two main views about the origin of the T c enhancement: interfacial effects and/or excess electrons with strong electron correlation. Here, we report the observation of superconductivity below 20 K in surface electron-doped bulk FeSe. The doped surface layer possesses all the key spectroscopic aspects of the monolayer FeSe on SrTiO 3 . Without interfacial effects, the surface layer state has a moderate T c of 20 K with a smaller gap opening of 4.2 meV. Our results show that excess electrons with strong correlation cannot induce the maximum T c , which in turn reveals the need for interfacial effects to achieve the highest T c in one monolayer FeSe on SrTiO 3 .},

  doi          = {10.1038/ncomms11116},

  journal      = {Nature Communications},

  number       = ,

  volume       = 7,

  place        = {United States},

  year         = {Wed Apr 06 00:00:00 EDT 2016},

  month        = {Wed Apr 06 00:00:00 EDT 2016}

}

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Title: Superconductivity below 20 K in heavily electron-doped surface layer of FeSe bulk crystal

Abstract

Citation Formats

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

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

Meissner and mesoscopic superconducting states in 1–4 unit-cell FeSe films journal, December 2014

Electronic origin of high-temperature superconductivity in single-layer FeSe superconductor journal, January 2012

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

Dichotomy of the electronic structure and superconductivity between single-layer and double-layer FeSe/SrTiO3 films journal, September 2014

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

Interface-induced superconductivity and strain-dependent spin density waves in FeSe/SrTiO3 thin films journal, May 2013

Interface charge doping effects on superconductivity of single-unit-cell FeSe films on SrTiO 3 substrates journal, February 2014

Electronic evidence of an insulator–superconductor crossover in single-layer FeSe/SrTiO 3 films journal, December 2014

Strong Correlations and Magnetic Frustration in the High T c Iron Pnictides journal, August 2008

Iron pnictides as a new setting for quantum criticality journal, March 2009

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

Oxygen Vacancy Induced Flat Phonon Mode at FeSe /SrTiO3 interface journal, June 2015

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

Interface Ferroelectric Transition near the Gap-Opening Temperature in a Single-Unit-Cell FeSe Film Grown on Nb-Doped SrTiO 3 Substrate journal, January 2015

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

Fermi arcs in a doped pseudospin-1/2 Heisenberg antiferromagnet journal, June 2014

In situ doping control of the surface of high-temperature superconductors journal, June 2008

Lifting of xz / yz orbital degeneracy at the structural transition in detwinned FeSe journal, September 2014

Orbital-driven nematicity in FeSe journal, November 2014

Doping a Mott insulator: Physics of high-temperature superconductivity journal, January 2006

Superconductivity in iron compounds journal, December 2011

Magnetic effects at the interface between non-magnetic oxides journal, June 2007

Superconducting Interfaces Between Insulating Oxides journal, August 2007

Interface superconductor with gap behaviour like a high-temperature superconductor journal, October 2013

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

Direct Measurement of Quasiparticle-Lifetime Broadening in a Strong-Coupled Superconductor journal, November 1978

Common electronic origin of superconductivity in (Li,Fe)OHFeSe bulk superconductor and single-layer FeSe/SrTiO3 films journal, February 2016

Anomalous temperature dependence of the magnetic field penetration depth in superconducting UBe13 journal, June 1986

Weak Superconducting Pairing and a Single Isotropic Energy Gap in Stoichiometric LiFeAs journal, May 2010

Strong Correlations and Magnetic Frustration in the High Tc Iron Pnictides text, January 2008

Weak superconducting pairing and a single isotropic energy gap in stoichiometric LiFeAs text, January 2010

Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides text, January 2011

Superconductivity in Iron Compounds text, January 2011

Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3 text, January 2012

Electronic Origin of High Temperature Superconductivity in Single-Layer FeSe Superconductor text, January 2012

Direct observation of high temperature superconductivity in one-unit-cell FeSe films text, January 2013

Interfacial mode coupling as the origin of the enhancement of Tc in FeSe films on SrTiO3 text, January 2013

Electronic Evidence of an Insulator-Superconductor Transition in Single-Layer FeSe/SrTiO3 Films text, January 2014

Dichotomy of Electronic Structure and Superconductivity between Single-Layer and Double-Layer FeSe/SrTiO3 Films text, January 2014

Reconstruction of Band Structure Induced by Electronic Nematicity in an FeSe Superconductor text, January 2014

Lifting of xz/yz orbital degeneracy at the structural transition in detwinned FeSe text, January 2014

Oxygen Vacancy Induced Flat Phonon Mode at FeSe /SrTiO3 interface text, January 2015

Common Electronic Origin of Superconductivity in (Li,Fe)OHFeSe Bulk Superconductor and Single-Layer FeSe/SrTiO3 Films text, January 2015

Interface superconductor with gap behaviour like a high-temperature superconductor journal, October 2013

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

Orbital-driven nematicity in FeSe journal, November 2014

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

Oxygen Vacancy Induced Flat Phonon Mode at FeSe /SrTiO3 interface journal, June 2015

Reconstruction of Band Structure Induced by Electronic Nematicity in an FeSe Superconductor journal, December 2014

Superconducting Interfaces Between Insulating Oxides journal, August 2007

Electronic Evidence of an Insulator-Superconductor Transition in Single-Layer FeSe/SrTiO3 Films text, January 2014

Enhanced superconductivity in surface-electron-doped iron pnictide Ba(Fe1.94Co0.06)2As2 journal, August 2016

Giant thermoelectric power factor in ultrathin FeSe superconductor journal, February 2019

High-temperature superconductivity in one-unit-cell FeSe films journal, March 2017

Role of SrTiO 3 phonon penetrating into thin FeSe films in the enhancement of superconductivity journal, August 2016

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

Diamagnetic Response of Potassium-Adsorbed Multilayer FeSe Film journal, December 2019

Nematic Energy Scale and the Missing Electron Pocket in FeSe journal, December 2019

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

High-temperature superconductivity in one-unit-cell FeSe films text, January 2017

Giant thermoelectric power factor in ultrathin FeSe superconductor journal, February 2019

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

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

Meissner and mesoscopic superconducting states in 1–4 unit-cell FeSe films
journal, December 2014

Electronic origin of high-temperature superconductivity in single-layer FeSe superconductor
journal, January 2012

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

Dichotomy of the electronic structure and superconductivity between single-layer and double-layer FeSe/SrTiO3 films
journal, September 2014

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

Interface-induced superconductivity and strain-dependent spin density waves in FeSe/SrTiO3 thin films
journal, May 2013

Interface charge doping effects on superconductivity of single-unit-cell FeSe films on ${SrTiO}_{3}$ substrates
journal, February 2014

Electronic evidence of an insulator–superconductor crossover in single-layer FeSe/SrTiO ₃ films
journal, December 2014

Strong Correlations and Magnetic Frustration in the High $T_{c}$ Iron Pnictides
journal, August 2008

Iron pnictides as a new setting for quantum criticality
journal, March 2009

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

Oxygen Vacancy Induced Flat Phonon Mode at FeSe /SrTiO3 interface
journal, June 2015

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

Interface Ferroelectric Transition near the Gap-Opening Temperature in a Single-Unit-Cell FeSe Film Grown on Nb-Doped SrTiO 3 Substrate
journal, January 2015

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

Fermi arcs in a doped pseudospin-1/2 Heisenberg antiferromagnet
journal, June 2014

In situ doping control of the surface of high-temperature superconductors
journal, June 2008

Lifting of xz / yz orbital degeneracy at the structural transition in detwinned FeSe
journal, September 2014

Orbital-driven nematicity in FeSe
journal, November 2014

Doping a Mott insulator: Physics of high-temperature superconductivity
journal, January 2006

Superconductivity in iron compounds
journal, December 2011

Magnetic effects at the interface between non-magnetic oxides
journal, June 2007

Superconducting Interfaces Between Insulating Oxides
journal, August 2007

Interface superconductor with gap behaviour like a high-temperature superconductor
journal, October 2013

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

Direct Measurement of Quasiparticle-Lifetime Broadening in a Strong-Coupled Superconductor
journal, November 1978

Common electronic origin of superconductivity in (Li,Fe)OHFeSe bulk superconductor and single-layer FeSe/SrTiO3 films
journal, February 2016

Anomalous temperature dependence of the magnetic field penetration depth in superconducting UBe13
journal, June 1986

Weak Superconducting Pairing and a Single Isotropic Energy Gap in Stoichiometric LiFeAs
journal, May 2010

Strong Correlations and Magnetic Frustration in the High Tc Iron Pnictides
text, January 2008

Weak superconducting pairing and a single isotropic energy gap in stoichiometric LiFeAs
text, January 2010

Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides
text, January 2011

Superconductivity in Iron Compounds
text, January 2011

Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3
text, January 2012

Electronic Origin of High Temperature Superconductivity in Single-Layer FeSe Superconductor
text, January 2012

Direct observation of high temperature superconductivity in one-unit-cell FeSe films
text, January 2013

Interfacial mode coupling as the origin of the enhancement of Tc in FeSe films on SrTiO3
text, January 2013

Electronic Evidence of an Insulator-Superconductor Transition in Single-Layer FeSe/SrTiO3 Films
text, January 2014

Dichotomy of Electronic Structure and Superconductivity between Single-Layer and Double-Layer FeSe/SrTiO3 Films
text, January 2014

Reconstruction of Band Structure Induced by Electronic Nematicity in an FeSe Superconductor
text, January 2014

Lifting of xz/yz orbital degeneracy at the structural transition in detwinned FeSe
text, January 2014

Oxygen Vacancy Induced Flat Phonon Mode at FeSe /SrTiO3 interface
text, January 2015

Common Electronic Origin of Superconductivity in (Li,Fe)OHFeSe Bulk Superconductor and Single-Layer FeSe/SrTiO3 Films
text, January 2015

Interface superconductor with gap behaviour like a high-temperature superconductor
journal, October 2013

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

Orbital-driven nematicity in FeSe
journal, November 2014

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

Oxygen Vacancy Induced Flat Phonon Mode at FeSe /SrTiO3 interface
journal, June 2015

Reconstruction of Band Structure Induced by Electronic Nematicity in an FeSe Superconductor
journal, December 2014

Superconducting Interfaces Between Insulating Oxides
journal, August 2007

Electronic Evidence of an Insulator-Superconductor Transition in Single-Layer FeSe/SrTiO3 Films
text, January 2014

Enhanced superconductivity in surface-electron-doped iron pnictide Ba(Fe1.94Co0.06)2As2
journal, August 2016

Giant thermoelectric power factor in ultrathin FeSe superconductor
journal, February 2019

High-temperature superconductivity in one-unit-cell FeSe films
journal, March 2017

Role of ${SrTiO}_{3}$ phonon penetrating into thin FeSe films in the enhancement of superconductivity
journal, August 2016

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

Diamagnetic Response of Potassium-Adsorbed Multilayer FeSe Film
journal, December 2019

Nematic Energy Scale and the Missing Electron Pocket in FeSe
journal, December 2019

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

High-temperature superconductivity in one-unit-cell FeSe films
text, January 2017

Giant thermoelectric power factor in ultrathin FeSe superconductor
journal, February 2019