Order parameter of MgB2: A fully gapped superconductor

H. D. Yang*, Jiunn-Yuan Lin, H. H. Li, F. H. Hsu, C. J. Liu, S. C. Li, R. C. Yu, C. Q. Jin

*此作品的通信作者

研究成果: Article同行評審

161 引文 斯高帕斯(Scopus)

摘要

We have measured the low-temperature specific heat C(T) for polycrystalline MgB 2 prepared by high pressure synthesis. C(T) below 10 K vanishes exponentially, which unambiguously indicates a fully opened superconducting energy gap. However, this gap is found to be too small to account for T c of MgB 2 . Together with the small specific heat jump ΔC/γ n T c = 1.09, scenarios such as anisotropic s-wave or multicomponent order parameter are called for. The magnetic field dependence of γ(H) is neither linear for a fully gapped s-wave superconductor nor H 1/2 for nodal order parameter. It seems that this intriguing behavior of γ(H) is associated with the intrinsic electronic properties other than flux pinning.

原文English
文章編號167003
期刊Physical Review Letters
87
發行號16
DOIs
出版狀態Published - 15 10月 2001

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