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Thermal properties of MgB2: the effect of disorder on gap amplitudes and relaxation times of π and σ bands

✍ Scribed by M. Putti; E. Galleani; I. Pallecchi; C. Bernini; P. Manfrinetti; A. Palenzona; M. Affronte

Publisher: Elsevier Science
Year: 2004
Tongue: English
Weight: 249 KB
Volume: 408-410
Category: Article
ISSN: 0921-4534
DOI: 10.1016/j.physc.2004.02.171

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✦ Synopsis

We present thermal conductivity and specific heat measurements on MgB 2 and Mg-AlB 2 samples. Thermal properties have been analyzed by using a two-gap model in order to estimate the gap amplitudes, Dð0Þ p and Dð0Þ r and the intra-band scattering rates, C rr and C pp . Dð0Þ r rapidly decreases as a function of Al doping and disorder, while Dð0Þ p is rather constant. C rr and C pp are increased by disorder, being C pp more affected than C rr .

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