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- Title
Interface-induced superconductivity and strain-dependent spin density waves in FeSe/SrTiO<sub>3</sub> thin films.
- Authors
Tan, Shiyong; Zhang, Yan; Xia, Miao; Ye, Zirong; Chen, Fei; Xie, Xin; Peng, Rui; Xu, Difei; Fan, Qin; Xu, Haichao; Jiang, Juan; Zhang, Tong; Lai, Xinchun; Xiang, Tao; Hu, Jiangping; Xie, Binping; Feng, Donglai
- Abstract
The record superconducting transition temperature (Tc) for the iron-based high-temperature superconductors (Fe-HTS) has long been 56 K. Recently, in single-layer FeSe films grown on SrTiO3 substrates, indications of a new record of 65 K have been reported. Using in situ photoemission measurements, we substantiate the presence of spin density waves (SDWs) in FeSe films-a key ingredient of Fe-HTS that was missed in FeSe before-and we find that this weakens with increased thickness or reduced strain. We demonstrate that the superconductivity occurs when the electrons transferred from the oxygen-vacant substrate suppress the otherwise pronounced SDWs in single-layer FeSe. Beyond providing a comprehensive understanding of FeSe films and directions to further enhance its Tc, we map out the phase diagram of FeSe as a function of lattice constant, which contains all the essential physics of Fe-HTS. With the simplest structure, cleanest composition and single tuning parameter, monolayer FeSe is an ideal system for testing theories of Fe-HTS.
- Subjects
SUPERCONDUCTIVITY; STRAINS &; stresses (Mechanics); DENSITY wave theory; ROTATIONAL motion; IRON selenides; STRONTIUM titanate
- Publication
Nature Materials, 2013, Vol 12, Issue 7, p634
- ISSN
1476-1122
- Publication type
Article
- DOI
10.1038/nmat3654