Interface enhanced superconductivity in monolayer FeSe film on oxide substrate

Ding Cui; Liu Chong; Zhang Qing-Hua; Gong Guan-Ming; Wang Heng; Liu Xiao-Zhi; Meng Fan-Qi; Yang Hao-Hao; Wu Rui; Song Can-Li; Li Wei; He Ke; Ma Xu-Cun; Gu Lin; Wang Li-Li; Xue Qi-Kun

doi:10.7498/aps.67.20181681

Abstract

We report on the observation of a superconducting gap of about 14-15 meV, significantly enlarged compared with the value of 2.2 meV for bulk FeSe, in monolayer FeSe film interfaced with MgO epitaxial on SrTiO3(001) substrate by using the scanning tunneling microscopy. While the MgO exhibits the same work function as SrTiO3 substrate, the gap magnitude is in coincidence with that of surface K-doped two-unit-cell FeSe film on SrTiO3(001), suggesting that the interface enhanced superconductivity might be attributed to cooperation of interface charge transfer driven by band bending with interface electron-phonon coupling as discovered at FeSe/TiO2 interfaces. On the other hand, the observation of such an enlarged superconducting gap, complementary to our previous transport observation of an onset superconducting transition temperature of 18 K in monolayer FeSe film on a bulk MgO substrate, implies that FeSe/MgO interface is likely to be a new interface high-temperature superconducting system, providing a new platform for investigating the mechanism of interface hightemperature superconductivity.

Keywords:

FeSe/MgO /
interface enhanced superconductivity /
scanning tunneling microscopy /
scanning transmission electron microscopy

Authors and contacts

1.
State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China;
2.
Beijing National Laboratory for Condensed Matter Physics, Laboratory for Advanced Materials and Electron Microscopy, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3.
Collaborative Innovation Center of Quantum Matter, Beijing 100084, China

Corresponding author: Wang Li-Li, liliwang@mail.tsinghua.edu.cn;qkxue@mail.tsinghua.edu.cn ; Xue Qi-Kun, liliwang@mail.tsinghua.edu.cn;qkxue@mail.tsinghua.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 11574174, 11774193, 11790311, 51522212, 51421002, 51672307), the National Basic Research Program of China (Grant Nos. 2015CB921000, 2014CB921002), and the Strategic Priority Research Program of the Chinese Academy of Sciences, China (Grant No. XDB07030200).

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Cited By

[1]	Wang Q Y, Li Z, Zhang W H, et al. 2012 Chin. Phys. Lett. 29 037402
[2]	Song C L, Wang Y L, Cheng P, et al. 2011 Science 332 1410
[3]	Zhang W H, Sun Y, Zhang J S, et al. 2014 Chin. Phys. Lett. 31 017401
[4]	Zhang Z, Wang Y H, Song Q, et al. 2015 Sci. Bull. 60 1301
[5]	Ge J F, Liu Z L, Liu C, et al. 2015 Nat. Mater. 14 285
[6]	Peng R, Xu H C, Tan S Y, et al. 2014 Nat. Commun. 5 5044
[7]	Zhou G, Zhang D, Liu C, et al. 2016 Appl. Phys. Lett. 108 202603
[8]	Zhang P, Peng X L, Qian T, et al. 2016 Phys. Rev. B 94 104510
[9]	Zhang C, Liu Z, Chen Z, et al. 2017 Nat. Commun. 8 14468
[10]	Ding H, Lv Y F, Zhao K, et al. 2016 Phys. Rev. Lett. 117 067001
[11]	Rebec S N, Jia T, Zhang C, et al. 2017 Phys. Rev. Lett. 118 067002
[12]	Wang L, Ma X C, Xue Q K 2016 Supercond. Sci. Technol. 29 123001
[13]	Wang L, Xue Q K 2017 AAPPS Bull. 27 4
[14]	Maletz J, Zabolotnnyy V B, Evtushinsky D V, et al. 2014 Phys. Rev. B 89 220506(R)
[15]	He S, He J, Zhang W, et al. 2013 Nat. Mater. 12 605
[16]	Tan S, Zhang Y, Xia M, et al. 2013 Nat. Mater. 12 634
[17]	Lee J J, Schmitt F T, Moore R G, et al. 2014 Nature 515 245
[18]	Song C L, Zhang H M, Zhong Y, et al. 2016 Phys. Rev. Lett. 116 157001
[19]	Guo J, Jin S, Wang G, et al. 2010 Phys. Rev. B 82 180520
[20]	Lu X F, Wang N Z, Wu H, et al. 2015 Nat. Mater. 14 325
[21]	Shiogai J, Ito Y, Mitsuhashi T, et al. 2015 Nat. Phys. 12 42
[22]	Lei B, Cui J H, Xiang Z J, et al. 2016 Phys. Rev. Lett. 116 077002
[23]	Hanzawa K, Sato H, Hiramatsu H, et al. 2016 Proc. Natl. Acad. Sci. U.S.A. 113 3986
[24]	Zhang S, Guan J, Jia X, et al. 2016 Phys. Rev. B 94 081116
[25]	Zhang H, Zhang D, Lu X, et al. 2017 Nat. Commun. 8 214
[26]	Tang C, Liu C, Zhou G, et al. 2016 Phys. Rev. B 93 020507
[27]	Zhang W H, Liu X, Wen C H, et al. 2016 Nano Lett. 16 1969
[28]	Xie Y, Cao H Y, Zhou Y, et al. 2015 Sci. Rep. 5 10011
[29]	Wang Y, Linscheid A, Berlijn T, et al. 2016 Phys. Rev. B 93 134513
[30]	Li Z X, Wang F, Yao H, et al. 2016 Sci. Bull. 61 925
[31]	Lee D H 2018 Ann. Rev. Conden. Matter Phys. 9 261
[32]	Chu C W, Deng L Z, Lv B 2015 Physica C 514 290
[33]	Kamihara Y, Watanabe T, Hirano M, et al. 2008 J. Am. Chem. Soc. 130 3296
[34]	Ren Z, Lu W, Yang J, et al. 2008 Chin. Phys. Lett. 25 2215
[35]	Dingle R, Stormer H L, Gossard A C, Wiegmann W 1978 Appl. Phys. Lett. 33 665
[36]	Zhou G, Zhang Q, Zheng F, et al. 2018 Sci. Bull. 63 747
[37]	Binnig G, Rohrer H 1983 Surf. Sci. 126 236
[38]	Lim J Y, Oh J S, Ko B D, et al. 2003 J. Appl. Phys. 94 764
[39]	Susaki T, Shigaki N, Matsuzaki K, et al. 2014 Phys. Rev. B 90 035453
[40]	Li F, Zhang Q, Tang C, et al. 2016 2D Mater. 3 024002
[41]	Choubey P, Berlijn T, Kreisel A, et al. 2014 Phys. Rev. B 90 134520
[42]	Liu C, Mao J, Ding H, et al. 2018 Phys. Rev. B 97 024502
[43]	Zhang W, Li Z, Li F, et al. 2014 Phys. Rev. B 89 060506
[44]	Parlinski K, Łazewski J, Kawazoe Y 2000 J. Phys. Chem. Solids 61 87
[45]	Wang Y, Liu Z K, Chen L Q, et al. 2006 J. Appl. Phys. 100 023533
[46]	Oshima C, Aizawa T, Souda R, et al. 1990 Solid State Commun. 73 731
[47]	Coh S, Lee D H, Louie S G, et al. 2016 Phys. Rev. B 93 245138
[48]	Niu F, Meier A L, Wessels B W 2006 J. Vac. Sci. Technol. B 24 2586

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Vol. 67, Issue 20 - 2018-10-20

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