Physics – Condensed Matter – Superconductivity
Scientific paper
2002-10-02
Supercond.Sci.Technol. 16 (2003) 188
Physics
Condensed Matter
Superconductivity
8 pages, 5 figures, Presented at the BOROMAG workshop, June 17-19 2002, Genoa, Italy
Scientific paper
10.1088/0953-2048/16/2/311
We present resistivity and thermal conductivity measurements on bulk samples, prepared either by a standard method or by a one-step technique. The latter samples, due to their high density and purity, show residual resistivity values as low as 0.5 mW cm and thermal conductivity values as high as 215 W/mK, higher than the single crystal ones. Thermal and electrical data of all the samples are analysed in the framework of the Bloch-Gruneisen equation giving reliable parameter values. In particular the temperature resitivity coefficient, obtained both from resistivity and thermal conductivity, in the dirty sample comes out ten time larger than in the clean ones. This result supports the hypothesis of ref. [1] that p and s bands conduct in parallel, prevailing p conduction in clean samples and s conduction in dirty samples .
Braccini Valeria
Galleani E.
Manfrinetti P.
Napoli F.
Palenzona Andrea
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