期刊
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
卷 469, 期 9-12, 页码 340-349出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physc.2009.03.022
关键词
FeSe superconductor; Single crystal; Thin film; Chemical doping; Transport properties; Magnetic properties; Specific heat; Structural distortion
资金
- Taiwan National Science Council
- US Air Force Office of Scientific Research
An overview of the recent development of the superconducting FeSe1-x and related compounds is presented. Methods to synthesize high purity polycrystalline samples, single crystals and thin films with preferred orientation are described. In addition to the synthesis of FeSe and FeSeTe, the effects of various partial chemical substitutions on Fe and Se/Te site are described. It was found that the effects of chemical doping to the Se-site or Fe-site are rather different. Ionic size of the dopant is found to play a critical role on the occurrence of superconductivity. We also review the physical properties, including transport, magnetic, and thermal properties. There exist interesting transport anomalies in the resistivity at low temperature, and it was found that a structural distortion at low temperature is critical to the occurrence of superconductivity in these materials. However, the exact origin of these observed anomalies is not clear, and the exact pairing symmetry in FeSe-based superconductors is also still in question. (C) 2009 Published by Elsevier B.V.
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