Thermal properties of MgB2: the effect of disorder on gap amplitudes and relaxation times of p and s bands

Details Thermal properties of MgB2: the effect of disorder on gap amplitudes and relaxation times of p and s bands Thermal properties of MgB2: the effect of disorder on gap amplitudes and relaxation times of p and s bands

2003-06-05

arxiv.org/abs/cond-mat/0306137v1

Physics

Condensed Matter

Superconductivity

2 pages, 3 figures, presented to the conference M2S-HTSC, 25-30 May 2003, Rio de Janeiro

Scientific paper

10.1016/j.physc.2004.02.171

We present thermal conductivity and specific heat measurements on MgB2 and Mg-AlB2 samples. Thermal properties have been analysed by using a two-gap model in order to estimate the gap amplitudes, D(0)p and D(0)s and the intra-band scattering rates, Gss and Gpp. As a function of Al doping and disorder D(0)s rapidly decreases, while D(0)p is rather constant. Gss and Gpp are increased by the disorder, being Gpp more affected than Gss.

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