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Order parameter of MgB_2: 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
; | Date: |
30 Apr 2001 | Subject: | Superconductivity | cond-mat.supr-con | Abstract: | 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 Tc of MgB_2. Together with the small specific heat jump DeltaC/gamma_nTc=1.13, scenarios like anisotropic s-wave or multi-component 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. | Source: | arXiv, cond-mat/0104574 | Services: | Forum | Review | PDF | Favorites |
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