Quasi-2D superconductivity in FeTe0.55Se0.45 ultrathin film [Quasi Two-Dimensional Superconductivity in FeTe0.55Se0.45 ultrathin film]

Tang, Fangdong; Wang, Peipei; Wang, Peng; Gan, Yuan; Gu, Genda D.; Zhang, Wei; He, Mingquan; Zhang, Liyuan

doi:10.1088/1361-648X/ab14c3

Title: Quasi-2D superconductivity in FeTe_0.55Se_0.45 ultrathin film [Quasi Two-Dimensional Superconductivity in FeTe_0.55Se_0.45 ultrathin film]

Journal Article · Tue Apr 23 00:00:00 EDT 2019 · Journal of Physics. Condensed Matter

DOI:https://doi.org/10.1088/1361-648X/ab14c3· OSTI ID:1525398

^[1]; Wang, Peipei ^[2]; Wang, Peng ^[2]; Gan, Yuan ^[2];

^[3]; Zhang, Wei ^[4]; He, Mingquan ^[5]; Zhang, Liyuan ^[6]

Renmin Univ. of China, Beijing (People's Republic of China); Southern Univ. of Science and Technology, Shenzhen (People's Republic of China)
Southern Univ. of Science and Technology, Shenzhen (People's Republic of China)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Renmin Univ. of China, Beijing (People's Republic of China)
Chongqing Univ., Chongqing (People's Republic of China)
Southern Univ. of Science and Technology, Shenzhen (People's Republic of China); Chongqing Univ., Chongqing (People's Republic of China)

Iron-chalcogenide FeTe_0.55Se_0.45 was found to be a promising topological superconducting candidate recently, which may host Majorana bound state in the vortex core and thus attracts intensive research interests in this material. In this report, mechanically exfoliated FeTe_0.55Se_0.45 superconducting thin films close to the two-dimensional (2D) limit, i.e. sample thickness is on the order of coherence length, were studied systematically by means of electrical transport and point-contact Andreev-reflection spectroscopy (PCARS) measurements. The quasi-2D nature of FeTe_0.55Se_0.45 thin films is evidenced by the observation of Berezinskii–Kosterlitz–Thouless (BKT) transition and anisotropic upper critical fields in the vicinity of superconducting transition. Compared to bulk samples, we found that the superconducting transition temperature is only slightly suppressed even for films down to 5 nm. The superconducting gap symmetry remains unchanged and the gap size is weakly affected by tailoring thickness. Furthermore, our findings suggest that the superconductivity of FeTe_0.55Se_0.45 thin films is rather robust against reduced dimensions. It provides a novel platform for device applications for quantum computations in combination with possible realization of Majorana modes in this material.

View Accepted Manuscript (DOE)

Cite

Export

Save

Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

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

Grant/Contract Number:: SC0012704

OSTI ID:: 1525398

Report Number(s):: BNL-211753-2019-JAAM

Journal Information:: Journal of Physics. Condensed Matter, Vol. 31, Issue 26; ISSN 0953-8984

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 3 works

Citation information provided by
Web of Science

References (34)

Superconductivity in the PbO-type structure -FeSe 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	journal	September 2008
High-temperature superconductivity in iron-based materials Paglione, Johnpierre; Greene, Richard L. Nature Physics, Vol. 6, Issue 9 https://doi.org/10.1038/nphys1759	journal	August 2010
Phase diagram and electronic indication of high-temperature superconductivity at 65 K in single-layer FeSe films He, Shaolong; He, Junfeng; Zhang, Wenhao Nature Materials, Vol. 12, Issue 7 https://doi.org/10.1038/nmat3648	journal	May 2013
Superconductivity above 100 K in single-layer FeSe films on doped SrTiO3 Ge, Jian-Feng; Liu, Zhi-Long; Liu, Canhua Nature Materials, Vol. 14, Issue 3 https://doi.org/10.1038/nmat4153	journal	November 2014
Observation of topological superconductivity on the surface of an iron-based superconductor Zhang, Peng; Yaji, Koichiro; Hashimoto, Takahiro Science, Vol. 360, Issue 6385 https://doi.org/10.1126/science.aan4596	journal	March 2018
Evidence for Majorana bound states in an iron-based superconductor Wang, Dongfei; Kong, Lingyuan; Fan, Peng Science, Vol. 362, Issue 6412 https://doi.org/10.1126/science.aao1797	journal	August 2018
Pauli-limited upper critical field of ${Fe}_{1 + y} {Te}_{1 - x} {Se}_{x}$ Lei, Hechang; Hu, Rongwei; Choi, E. S. Physical Review B, Vol. 81, Issue 9 https://doi.org/10.1103/PhysRevB.81.094518	journal	March 2010
Unconventional s-Wave Superconductivity in Fe(Se,Te) Hanaguri, T.; Niitaka, S.; Kuroki, K. Science, Vol. 328, Issue 5977 https://doi.org/10.1126/science.1187399	journal	April 2010
Anisotropic structure of the order parameter in FeSe0.45Te0.55 revealed by angle-resolved specific heat Zeng, B.; Mu, G.; Luo, H. Q. Nature Communications, Vol. 1, Issue 1 https://doi.org/10.1038/ncomms1115	journal	November 2010
Electronic correlations and unusual superconducting response in the optical properties of the iron chalcogenide ${FeTe}_{0.55} {Se}_{0.45}$ Homes, C. C.; Akrap, A.; Wen, J. S. Physical Review B, Vol. 81, Issue 18 https://doi.org/10.1103/PhysRevB.81.180508	journal	May 2010
Superconducting properties of iron chalcogenide thin films Mele, Paolo Science and Technology of Advanced Materials, Vol. 13, Issue 5 https://doi.org/10.1088/1468-6996/13/5/054301	journal	October 2012
Two-dimensional atomic crystals Novoselov, K. S.; Jiang, D.; Schedin, F. Proceedings of the National Academy of Sciences, Vol. 102, Issue 30, p. 10451-10453 https://doi.org/10.1073/pnas.0502848102	journal	July 2005
High-Tc superconductivity in ultrathin Bi2Sr2CaCu2O8+x down to half-unit-cell thickness by protection with graphene Jiang, Da; Hu, Tao; You, Lixing Nature Communications, Vol. 5, Issue 1 https://doi.org/10.1038/ncomms6708	journal	December 2014
Gate-tunable phase transitions in thin flakes of 1T-TaS2 Yu, Yijun; Yang, Fangyuan; Lu, Xiu Fang Nature Nanotechnology, Vol. 10, Issue 3 https://doi.org/10.1038/nnano.2014.323	journal	January 2015
Ising pairing in superconducting NbSe2 atomic layers Xi, Xiaoxiang; Wang, Zefang; Zhao, Weiwei Nature Physics, Vol. 12, Issue 2 https://doi.org/10.1038/nphys3538	journal	November 2015
Evidence for dominant Pauli paramagnetic effect in the upper critical field of single-crystalline ${FeTe}_{0.6} {Se}_{0.4}$ Khim, Seunghyun; Kim, Jae Wook; Choi, Eun Sang Physical Review B, Vol. 81, Issue 18 https://doi.org/10.1103/PhysRevB.81.184511	journal	May 2010
Ordering, metastability and phase transitions in two-dimensional systems Kosterlitz, J M; Thouless, D J Journal of Physics C: Solid State Physics, Vol. 6, Issue 7, p. 1181-1203 https://doi.org/10.1088/0022-3719/6/7/010	journal	April 1973
Resistive transition in superconducting films Halperin, B. I.; Nelson, David R. Journal of Low Temperature Physics, Vol. 36, Issue 5-6 https://doi.org/10.1007/BF00116988	journal	September 1979
Kosterlitz-Thouless Transition in Proximity-Coupled Superconducting Arrays Resnick, D. J.; Garland, J. C.; Boyd, J. T. Physical Review Letters, Vol. 47, Issue 21 https://doi.org/10.1103/PhysRevLett.47.1542	journal	November 1981
Two-dimensional superconductivity at the interface of a Bi2Te3/FeTe heterostructure He, Qing Lin; Liu, Hongchao; He, Mingquan Nature Communications, Vol. 5, Issue 1 https://doi.org/10.1038/ncomms5247	journal	June 2014
Broadening of the Berezinskii-Kosterlitz-Thouless superconducting transition by inhomogeneity and finite-size effects Benfatto, L.; Castellani, C.; Giamarchi, T. Physical Review B, Vol. 80, Issue 21 https://doi.org/10.1103/PhysRevB.80.214506	journal	December 2009
Effective medium theory for superconducting layers: A systematic analysis including space correlation effects Caprara, S.; Grilli, M.; Benfatto, L. Physical Review B, Vol. 84, Issue 1 https://doi.org/10.1103/PhysRevB.84.014514	journal	July 2011
Pinning and creep in layered superconductors Feigel'man, M. V.; Geshkenbein, V. B.; Larkin, A. I. Physica C: Superconductivity, Vol. 167, Issue 1-2 https://doi.org/10.1016/0921-4534(90)90502-6	journal	April 1990
Nature of the quantum metal in a two-dimensional crystalline superconductor Tsen, A. W.; Hunt, B.; Kim, Y. D. Nature Physics, Vol. 12, Issue 3 https://doi.org/10.1038/nphys3579	journal	December 2015
Critical fields, thermally activated transport, and critical current density of $β$ -FeSe single crystals Lei, Hechang; Hu, Rongwei; Petrovic, C. Physical Review B, Vol. 84, Issue 1 https://doi.org/10.1103/PhysRevB.84.014520	journal	July 2011
Robust two-dimensional superconductivity and vortex system in Bi2Te3/FeTe heterostructures Liu, Hong-Chao; Li, Hui; He, Qing Lin Scientific Reports, Vol. 6, Issue 1 https://doi.org/10.1038/srep26168	journal	May 2016
Thermally activated flux motion in artificially grown ${YBa}_{2}$ ${Cu}_{3}$ $O_{7}$ / ${PrBa}_{2}$ ${Cu}_{3}$ $O_{7}$ superlattices Brunner, O.; Antognazza, L.; Triscone, J. -M. Physical Review Letters, Vol. 67, Issue 10 https://doi.org/10.1103/PhysRevLett.67.1354	journal	September 1991
High temperature superconducting FeSe films on SrTiO3 substrates Sun, Yi; Zhang, Wenhao; Xing, Ying Scientific Reports, Vol. 4, Issue 1 https://doi.org/10.1038/srep06040	journal	August 2014
Directional point-contact Andreev-reflection spectroscopy of Fe-based superconductors: Fermi surface topology, gap symmetry, and electron–boson interaction Daghero, D.; Tortello, M.; Ummarino, G. A. Reports on Progress in Physics, Vol. 74, Issue 12 https://doi.org/10.1088/0034-4885/74/12/124509	journal	November 2011
Pseudogap and proximity effect in the Bi2Te3/Fe1+yTe interfacial superconductor He, M. Q.; Shen, J. Y.; Petrović, A. P. Scientific Reports, Vol. 6, Issue 1 https://doi.org/10.1038/srep32508	journal	September 2016
Point-contact Andreev-reflection spectroscopy in Fe(Te,Se) films: multiband superconductivity and electron-boson coupling Daghero, D.; Pecchio, P.; Ummarino, G. A. Superconductor Science and Technology, Vol. 27, Issue 12 https://doi.org/10.1088/0953-2048/27/12/124014	journal	November 2014
Transition from metallic to tunneling regimes in superconducting microconstrictions: Excess current, charge imbalance, and supercurrent conversion Blonder, G. E.; Tinkham, M.; Klapwijk, T. M. Physical Review B, Vol. 25, Issue 7 https://doi.org/10.1103/PhysRevB.25.4515	journal	April 1982
Electronic origin of high-temperature superconductivity in single-layer FeSe superconductor Liu, Defa; Zhang, Wenhao; Mou, Daixiang Nature Communications, Vol. 3, Issue 1 https://doi.org/10.1038/ncomms1946	journal	January 2012
Evidence for two-gap nodeless superconductivity in ${SmFeAsO}_{1 - x} F_{x}$ from point-contact Andreev-reflection spectroscopy Daghero, D.; Tortello, M.; Gonnelli, R. S. Physical Review B, Vol. 80, Issue 6 https://doi.org/10.1103/PhysRevB.80.060502	journal	August 2009

Similar Records

Spatially dispersing Yu-Shiba-Rusinov states in the unconventional superconductor FeTe_0.55Se_0.45

Journal Article · Tue Jan 12 00:00:00 EST 2021 · Nature Communications · OSTI ID:1525398

Chatzopoulos, Damianos; Cho, Doohee; Bastiaans, Koen M.; +7 more

Anisotropy in upper critical field of FeTe{sub 0.55}Se{sub 0.45}

Journal Article · Wed Jun 24 00:00:00 EDT 2015 · AIP Conference Proceedings · OSTI ID:1525398

Shruti, ; Sharma, G.

Observation of an electron band above the Fermi level in FeTe{sub 0.55}Se{sub 0.45} from in-situ surface doping

Journal Article · Mon Oct 27 00:00:00 EDT 2014 · Applied Physics Letters · OSTI ID:1525398

Zhang, P.; Ma, J.; Qian, T.; +5 more

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
2D superconductivity
FeTe0.55Se0.45 thin film
BKT transition
point-contact Andreev-reflection spectroscopy

Title: Quasi-2D superconductivity in FeTe0.55Se0.45 ultrathin film [Quasi Two-Dimensional Superconductivity in FeTe0.55Se0.45 ultrathin film]

Citation Formats

References (34)

Similar Records

Related Subjects

Title: Quasi-2D superconductivity in FeTe_0.55Se_0.45 ultrathin film [Quasi Two-Dimensional Superconductivity in FeTe_0.55Se_0.45 ultrathin film]