br Stripe phase in high-T-c superconductor FeSe/SrTiO3

Yuan, Yong-Hao1,2; Xue, Qi-Kun1,2,3,4; Li, Wei1,2

2022-06-20

10.7498/aps.71.20220118

ACTA PHYSICA SINICA   影响因子和分区

1000-3290

The enhancement of superconductivity in one unit-cell FeSe grown on SrTiO3 is an important discovery inhigh-temperature superconductivity. In this system, the crucial role of the SrTiO3 substrate has beenextensively studied. Its contribution mainly manifests in two aspects: charge transfer and interfacial electron-phonon coupling. However, study of the intrinsic properties of the FeSe thin film itself is still insufficient. In thisarticle, we review the latest research progress of the mechanism of the enhancement of superconductivity inFeSe/SrTiO3, covering the newly discovered stripe phase and its relationship with superconductivity. By usingscanning tunneling microscope and molecular beam epitaxy growth method, we find that the electrons in FeSethin film tend to form stripe patterns, and show a thickness-dependent evolution of short-range to long-rangestripe phase. The stripe phase, a kind of electronic liquid crystal state (smectic), originates from the enhancedelectronic correlation in FeSe thin film. Surface doping can weaken the electronic correlation and graduallysuppress the stripe phase, which can induce superconductivity as well. More importantly, the remaining smecticfluctuation provides an additional enhancement to the superconductivity in FeSe film. Our results not onlydeepen the understanding of the interfacial superconductivity, but also reveal the intrinsic uniqueness of theFeSe films, which further refines the mechanism of superconductivity enhancement in FeSe/SrTiO3

stripe phase superconductivity enhancement electronic liquid crystal state scanning tunneling microscopy

SCI ; EI

英语

通讯

National Key R&D Program of China[2016YFA0301002] ; National Natural Science Foundation of China[11674191]

Physics

Physics, Multidisciplinary

WOS:000820182800012

CHINESE PHYSICAL SOC

PHYSICS

Web of Science

1.Tsinghua Univ, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China
2.Tsinghua Univ, Frontier Sci Ctr Quantum Informat, Beijing 100084, Peoples R China
3.Beijing Acad Quantum Informat Sci, Beijing 100193, Peoples R China
4.Southern Univ Sci & Technol, Shenzhen 518055, Peoples R China

Yuan, Yong-Hao,Xue, Qi-Kun,Li, Wei. br Stripe phase in high-T-c superconductor FeSe/SrTiO3[J]. ACTA PHYSICA SINICA,2022,71(12).

Yuan, Yong-Hao,Xue, Qi-Kun,&Li, Wei.(2022).br Stripe phase in high-T-c superconductor FeSe/SrTiO3.ACTA PHYSICA SINICA,71(12).

Yuan, Yong-Hao,et al."br Stripe phase in high-T-c superconductor FeSe/SrTiO3".ACTA PHYSICA SINICA 71.12(2022).