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

Fan, Xuemin1,2; Cui, Wenqiang1,3; Yuan, Yonghao1,2; Xue, Qi-Kun1,2,3,4; Li, Wei1,2

2022-07-26

10.1103/PhysRevB.106.024517

PHYSICAL REVIEW B   影响因子和分区

2469-9950

2469-9969

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.

SCI ; EI

英语

通讯

National Science Foundation of China["51788104","11427903","11674191"] ; Initiative Research Projects of Tsinghua University[20211080075]

Materials Science ; Physics

Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000836005100002

AMER PHYSICAL SOC

20223312565235

Iron-based Superconductors ; Molecular beam epitaxy ; Scanning tunneling microscopy ; Selenium compounds ; Strontium titanates ; Temperature

Thermodynamics:641.1 ; High Temperature Superconducting Materials:708.3.1 ; Chemical Products Generally:804 ; Atomic and Molecular Physics:931.3 ; Crystal Growth:933.1.2

PHYSICS

Web of Science

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

Fan, Xuemin,Cui, Wenqiang,Yuan, Yonghao,et al. Ubiquitous stripe phase and enhanced electron pairing in the interfacial high-T-c superconductor FeSe/BaTiO3[J]. PHYSICAL REVIEW B,2022,106(2).

Fan, Xuemin,Cui, Wenqiang,Yuan, Yonghao,Xue, Qi-Kun,&Li, Wei.(2022).Ubiquitous stripe phase and enhanced electron pairing in the interfacial high-T-c superconductor FeSe/BaTiO3.PHYSICAL REVIEW B,106(2).

Fan, Xuemin,et al."Ubiquitous stripe phase and enhanced electron pairing in the interfacial high-T-c superconductor FeSe/BaTiO3".PHYSICAL REVIEW B 106.2(2022).