標題: | BCS-like superconductivity in MgCNi3 |
作者: | Lin, JY Ho, PL Huang, HL Lin, PH Zhang, YL Yu, RC Jin, CQ Yang, HD 物理研究所 Institute of Physics |
公開日期: | 1-二月-2003 |
摘要: | The low-temperature specific heat C(T,H) of the superconductor MgCNi3 has been measured in detail. DeltaC/gamma(n)T(c)=1.97 is estimated from the anomaly at T-c. At low temperatures, the electronic contribution in the superconducting state follows C-es/gamma(n)T(c)approximate to7.96 exp(-1.46T(c)/T). The magnetic-field dependence of gamma(H) is found to be linear with respect to H. T-c estimated from the McMillan formula agrees well with the observed value. All the specific-heat data appear to be consistent with each other within the moderate-coupling BCS context. It is amazing that such a superconductor unstable to ferromagnetism behaves so conventionally. The Debye temperature Theta(D)=287 K and the normal state gamma(n)=33.6 mJ/mol K-2 are determined for the present sample. |
URI: | http://dx.doi.org/10.1103/PhysRevB.67.052501 http://hdl.handle.net/11536/28108 |
ISSN: | 1098-0121 |
DOI: | 10.1103/PhysRevB.67.052501 |
期刊: | PHYSICAL REVIEW B |
Volume: | 67 |
Issue: | 5 |
起始頁: | 0 |
結束頁: | 0 |
顯示於類別: | 期刊論文 |