Molecular beam epitaxy of single unit- cell FeSe superconducting films on SrTiO3 (001)

被引：5

作者：

Wang Meng ^{[1
,3
]}

Ou Yun-Bo ^{[3
]}

Li Fang-Sen ^{[2
,3
]}

Zhang Wen-Hao ^{[2
,3
]}

Tang Chen-Jia ^{[2
,3
]}

Wang Li-Li ^{[2
,3
]}

Xue Qi-Kun ^{[2
]}

Ma Xu-Cun ^{[2
,3
]}

机构：

[1] Beijing Univ Posts & Telecommun, Sch Elect Engn, Beijing 100876, Peoples R China

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

[3] Chinese Acad Sci, Inst Phys, State Key Lab Surface Phys, Beijing 100190, Peoples R China

来源：

ACTA PHYSICA SINICA | 2014年 / 63卷 / 02期

基金：

中国国家自然科学基金;

关键词：

SrTiO3(001); single unit-cell FeSe films; high temperature superconductivity; molecular beam epitaxy; PHASE TRANSITION; SURFACE;

D O I：

10.7498/aps.63.027401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Based on our previous work, we have systematically investigated the molecular beam epitaxy growth of single unit-cell FeSe films on SrTiO3(001) substrates and studied the surface morphology by scanning tunneling microscopy. We found that there are three key steps to obtain large-scale uniform one unit-cell superconducting FeSe films. First, the STO(001) substrates should be treated by HCl etching and thermal annealing under oxygen flux so that a specific TiO2- terminated STO(001) surface with well-defined step-terrace structure could be obtained. Second, the Fe and Se fluxes and substrate temperature have to be controlled delicately. At last, post-growth annealing is also critical, which can remove extra Se adatoms, and more importantly facilitate the necessary electron transfer for superconductivity transition.

引用

页数：5

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