Coherence lengths and anisotropy in MgB2 superconductor

A. Dulcic; M. Pozek; D. Paar; Eun-Mi Choi; Hyun-Jung Kim; W. N. Kang; Sung-Ik Lee

doi:10.1103/PhysRevB.67.020507

Coherence lengths and anisotropy in MgB2 superconductor

Superconductivity 2009-11-07 v1

Authors: A. Dulcic , M. Pozek , D. Paar , Eun-Mi Choi , Hyun-Jung Kim , W. N. Kang , Sung-Ik Lee

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Abstract

Field and temperature microwave measurements have been carried out on MgB2 thin film grown on Al2O3 substrate. The analysis reveals the mean field coherence length xi_{MF} in the mixed state and a temperature independent anisotropy ratio gamma_{MF} = xi_{MF}^{ab} / xi_{MF}^c approximately 2. At the superconducting transition, the scaling of the fluctuation conductivity yields the Ginzburg-Landau coherence length with a different anisotropy ratio gamma_{GL} = 2.8, also temperature independent.

Keywords

MgB2 superconductor coherence length anisotropy ratio mixed state microwave measurement fluctuation conductivity

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@article{arxiv.cond-mat/0207655,
  title  = {Coherence lengths and anisotropy in MgB2 superconductor},
  author = {A. Dulcic and M. Pozek and D. Paar and Eun-Mi Choi and Hyun-Jung Kim and W. N. Kang and Sung-Ik Lee},
  journal= {arXiv preprint arXiv:cond-mat/0207655},
  year   = {2009}
}

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Coherence lengths and anisotropy in MgB2 superconductor

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