Order parameter of MgB2: A fully gapped superconductor

H. D. Yang, J. Y. Lin, H. H. Li, F. H. Hsu, C. J. Liu, S. C. Li, R. C. Yu, C. Q. Jin

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4 Citations (Scopus)


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.

Original languageEnglish
JournalPhysical Review Letters
Issue number16
Publication statusPublished - 2001 Sep 26

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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