標題: Order parameter of MgB2: A fully gapped superconductor
作者: Yang, HD
Lin, JY
Li, HH
Hsu, FH
Liu, CJ
Li, SC
Yu, RC
Jin, CQ
物理研究所
Institute of Physics
公開日期: 15-Oct-2001
摘要: We have measured the low-temperature specific heat C(T) for polycrystalline MgB2 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, of MgB2. Together with the small specific heat jump DeltaC/gamma T-n(c) = 1.09, scenarios such as anisotropic s-wave or multicomponent order parameter are called for. The magnetic field dependence of gamma (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 gamma (H) is associated with the intrinsic electronic properties other than flux pinning.
URI: http://dx.doi.org/10.1103/PhysRevLett.87.167003
http://hdl.handle.net/11536/29338
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.87.167003
期刊: PHYSICAL REVIEW LETTERS
Volume: 87
Issue: 16
起始頁: 0
結束頁: 167003
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