Reversible magnetization of MgB2 single crystals with a two-gap nature

Byeongwon Kang; Heon-Jung Kim; min-Seok Park; Kyung-Hee Kim; Sung-Ik Lee

doi:10.1103/PhysRevB.69.144514

Reversible magnetization of MgB2 single crystals with a two-gap nature

Superconductivity 2009-11-10 v1

Authors: Byeongwon Kang , Heon-Jung Kim , min-Seok Park , Kyung-Hee Kim , Sung-Ik Lee

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Abstract

We present reversible magnetization measurements on MgB2 single crystals in magnetic fields up to 2.5 T applied parallel to the crystal's c-axis. This magnetization is analyzed in terms of the Hao-Clem model, and various superconducting parameters, such as the critical fields [Hc(0) and Hc2(0)], the characteristic lengths [xi(0) and lambda(0)], and the Ginzburg-Landau parameter, kappa, are derived. The temperature dependence of the magnetic penetration depth, lambda(T), obtained from the Hao-Clem analysis could not be explained by theories assuming a single gap. Our data are well described by using a two-gap model.

Keywords

MgB2 single crystals reversible magnetization two-gap model Hao-Clem model magnetic penetration depth Ginzburg-Landau parameter

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@article{arxiv.cond-mat/0403140,
  title  = {Reversible magnetization of MgB2 single crystals with a two-gap nature},
  author = {Byeongwon Kang and Heon-Jung Kim and min-Seok Park and Kyung-Hee Kim and Sung-Ik Lee},
  journal= {arXiv preprint arXiv:cond-mat/0403140},
  year   = {2009}
}

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20 pages, 1 table, 4 figures, will be published in Phys. Rev. B

Reversible magnetization of MgB2 single crystals with a two-gap nature

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