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- Title
Two-Band Calculations on the Upper Critical Field of ScFeSi.
- Authors
Liu, Minxia; Yang, Lichun; Xu, Yongzhao; Zhang, Geng; Zhang, Rui
- Abstract
The ternary compound ScFeSi has attracted much attention because of the various anomalous physical properties. The specific heat experiment and energy band structure calculation suggest that ScFeSi is a two-gap superconductor. Based on this, we analyze the upper critical field for superconducting ScFeSi crystals using the two-band Ginzburg-Landau theory. A two-parameter variational approach is adopted to obtain the upper critical field in arbitrary direction. The temperature and angular dependences of the upper critical field are plotted. The results reproduce the experimental data in a very broad temperature range and strongly support previous specific heat data and theoretical calculation, pointing to the existence of two energy gaps in ScFeSi. The anisotropy of the upper critical field is also studied and is about 2, in accordance with the experimental result. Moreover our calculations indicate that ScFeSi has rather a three-dimension character, in agreement with the energy band calculation.
- Subjects
SCANDIUM compounds; TERNARY alloys; SPECIFIC heat; SUPERCONDUCTORS; ELECTRONIC band structure; ANISOTROPY
- Publication
Journal of Superconductivity & Novel Magnetism, 2016, Vol 29, Issue 10, p2519
- ISSN
1557-1939
- Publication type
Article
- DOI
10.1007/s10948-016-3610-3