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Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/14169

Title: Order Parameter of MgB2: A Fully Gapped Superconductor
Authors: Yang, H. D.;Lin, J. Y.;Li, H. H.;Hsu, F. H.;Liu, Chia-Jyi;Li, S. C.;Yu, R. C.;Jin, C. Q.
Contributors: 物理學系
Date: 2001-10
Issue Date: 2012-09-10T06:13:49Z
Publisher: The American Physical Society
Abstract: 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.
Relation: Phys. Rev. Lett., 87(16): 167003
Appears in Collections:[物理學系] 期刊論文

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