Temperature dependence of thermal conductivity of vanadium substituted BPSCCO system between 10 and 150 K

Bulletin of materials science

T K Dey¹  A K Dhami¹ 

[1] Cryogenic Engineering Centre, Indian Institute of Technology, Kharagpur 721 302, India$$Cryogenic Engineering Centre, Indian Institute of Technology, Kharagpur 721 302, IndiaCryogenic Engineering Centre, Indian Institute of Technology, Kharagpur 721 302, India$$

关键词: Thermal conductivity;    high temperature superconductors;    vanadium substitution;    electron + phonon approach.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Thermal conductivity of a set of (Bi_0.8Pb_{0.2â€�?�ð�?��?}V_ð‘�?)₂Sr₂Ca₂Cu₃O_{10+ð›�?} (0 = ð‘�? â‰�? 0.05) pellets in the temperature range between 10 and 150 K is reported. Vanadium substitution influences strongly the magnitude of thermal conductivity (ðœ�?) over the entire temperature range. But the nature of ðœ�?(ð‘�??) dependence remains similar to that generally observed for HTSCs. The electronic contribution to the total ðœ�? in the normal state is estimated to be ∼ 25%. We have attempted to examine our data, assuming the role of both electrons and phonons in the origin of the ðœ�?(ð‘�??) behaviour below ð‘�??_ð‘�? . Observed temperature variation of ðœ�?(ð‘�??) for the present set of samples could be explained very well assuming this electron + approach. Some of the microscopic quantities estimated from the best-fit parameters give reasonable values.

【 授权许可】

Unknown