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題名: Order Parameter of MgB2: A Fully Gapped Superconductor
作者: Yang, H. D.;Lin, J. Y.;Li, H. H.;Hsu, F. H.;Liu, Chia-Jyi;Li, S. C.;Yu, R. C.;Jin, C. Q.
貢獻者: 物理學系
日期: 2001-10
上傳時間: 2012-09-10T06:13:49Z
出版者: The American Physical Society
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 Tc of MgB2. Together with the small specific heat jump ΔC/γnTc = 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 H1/2 for nodal order parameter. It seems that this intriguing behavior of γ(H) is associated with the intrinsic electronic properties other than flux pinning.
關聯: Phys. Rev. Lett., 87(16): 167003
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