Ubiquitous stripe phase and enhanced electron pairing in the interfacial high-Tc superconductor FeSe/BaTiO3

被引：3

作者：

Fan, Xuemin ^{[1
,2
]}

Cui, Wenqiang ^{[1
,3
]}

Yuan, Yonghao ^{[1
,2
]}

Xue, Qi-Kun ^{[1
,2
,3
,4
]}

Li, Wei ^{[1
,2
]}

机构：

[1] Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China

[2] 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

来源：

PHYSICAL REVIEW B | 2022年 / 106卷 / 02期

基金：

美国国家科学基金会;

关键词：

HIGH-TEMPERATURE SUPERCONDUCTIVITY; SINGLE-LAYER FESE; CRYSTAL-STATE; NEMATICITY; ANISOTROPY; ORIGIN;

D O I：

10.1103/PhysRevB.106.024517

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Monolayer FeSe grown on SrTiO3 provides a playground for high-T-c superconductivity. Authors of a recent study have shown the importance of stripy instability for superconductivity enhancement in FeSe/SrTiO3. However, it is still under debate whether such a stripe phase is ubiquitously bound to the interfacial superconductivity. Here, we report on molecular beam epitaxy growth and a low-temperature scanning tunneling microscopy study of FeSe films on BaTiO3(001). We find that the stripe phase is more prominent in s/BaTiO3. Long-range stripes exist in bilayer and triple-layer FeSe films at 4 K and even persist up to 77 K in the case of bilayer FeSe, with enlarged superconducting gaps upon alkali-metal deposition. The results point out an intimate correlation between the interfacial superconductivity and the stripe phase.

引用

页数：6

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