Two-Band Calculations on the Upper Critical Field of Sc2Fe3Si5

标题

Two-Band Calculations on the Upper Critical Field of Sc2Fe3Si5

作者

作者:Liu, MX (Liu, Minxia)^[1 ]; Yang, LC (Yang, Lichun)^[2 ]; Xu, YZ (Xu, Yongzhao)^[1 ]; Zhang, G (Zhang, Geng)^[1 ]; Zhang, R (Zhang, Rui)^[1 ]

期刊信息

摘要

The ternary compound Sc2Fe3Si5 has attracted much attention because of the various anomalous physical properties. The specific heat experiment and energy band structure calculation suggest that Sc2Fe3Si5 is a two-gap superconductor. Based on this, we analyze the upper critical field for superconducting Sc2Fe3Si5 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 Sc2Fe3Si5. 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 Sc2Fe3Si5 has rather a three-dimension character, in agreement with the energy band calculation.

关键词

作者关键词:Two-gap superconductor; Upper critical field; Ginzburg-Landau theory; Sc2Fe3Si5

作者信息

作者信息

通讯作者地址:Xu, YZ (通讯作者)

Dongguan Univ Technol, Sch Elect Engn, Dongguan 523808, Peoples R China.   增强组织信息的名称     Dongguan University of Technology

地址:

	[ 1 ] Dongguan Univ Technol, Sch Elect Engn, Dongguan 523808, Peoples R China   增强组织信息的名称     Dongguan University of Technology
	[ 2 ] South China Univ Technol, Guangdong Prov Key Lab Adv Energy Storage Mat, Sch Mat Sci & Engn, Guangzhou 510641, Guangdong, Peoples R China   增强组织信息的名称     South China University of Technology

电子邮件地址:xuyzdgut@sina.com

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