High temperature superconducting FeSe films on SrTiO3 substrates

被引：114
作者：
Sun, Yi [1 ]
Zhang, Wenhao [2 ,3 ]
Xing, Ying [1 ]
Li, Fangsen [2 ,3 ]
Zhao, Yanfei [1 ]
Xia, Zhengcai [5 ]
Wang, Lili [2 ,3 ,4 ]
Ma, Xucun [2 ,3 ,4 ]
Xue, Qi-Kun [2 ,4 ]
Wang, Jian [1 ,4 ]
机构：
[1] Peking Univ, Sch Phys, Int Ctr Quantum Mat, Beijing 100871, 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, Beijing 100190, Peoples R China
[4] Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China
[5] Huazhong Univ Sci & Technol, Wuhan Natl High Magnet Field Ctr, Wuhan 430071, Peoples R China
来源：
SCIENTIFIC REPORTS | 2014年 / 4卷
基金：
中国博士后科学基金; 中国国家自然科学基金;
关键词：
D O I：
10.1038/srep06040
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Interface enhanced superconductivity at two dimensional limit has become one of most intriguing research directions in condensed matter physics. Here, we report the superconducting properties of ultra-thin FeSe films with the thickness of one unit cell (1-UC) grown on conductive and insulating SrTiO3 (STO) substrates. For the 1-UC FeSe on conductive STO substrate (Nb-STO), the magnetization versus temperature (M-T) measurement shows a drop crossover around 85 K. For the FeSe films on insulating STO substrate, systematic transport measurements were carried out and the sheet resistance of FeSe films exhibits Arrhenius TAFF behavior with a crossover from a single-vortex pinning region to a collective creep region. More intriguing, sign reversal of Hall resistance with temperature is observed, demonstrating a crossover from hole conduction to electron conduction above T-C in 1-UC FeSe films.
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页数：8
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