Electron transport properties of MgB2 in the normal state |
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| Authors: | M. Putti E. Galleani d'Agliano D. Marrè F. Napoli M. Tassisto P. Manfrinetti A. Palenzona C. Rizzuto S. Massidda |
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| Affiliation: | (1) INFM/CNR, Dipartimento di Fisica, Via Dodecaneso 33, 16146 Genova, Italy, IT;(2) INFM, Dipartimento di Chimica e Chimica Industriale, Via Dodecaneso 31, 16146 Genova, Italy, IT;(3) Dipartimento di Chimica e Chimica Industriale, Via Dodecaneso 31, 16146 Genova, Sincrotrone di Trieste, Italy, IT;(4) INFM Dipartimento di Fisica, Università di Cagliari, S.P. Monserrato-Sestu Km 0.700, 09042 Monserrato (CA), Italy, IT |
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| Abstract: | We report measurements of the resistivity, ρ, and the Seebeck coefficient, S , of a MgB2 sintered sample, and compare S with theoretical calculations based on precise electronic structure calculations. ρ is fitted well by a generalized Bloch-Grüneisen equation with a Debye temperature Θ R of 1050 K. S is given by the sum of a diffusive and a phonon drag term and the behavior in the temperature region T c < T < 0.1Θ R follows the relationship AT+BT3. The phonon drag term indicates a strong electron-phonon interaction. The diffusive term, compared with calculations, suggests that σ bands give the main contribution to the Seebeck effect. Received 16 November 2001 and Received in final form 21 December 2001 |
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| Keywords: | PACS. 74.25.Fy Transport properties (electric and thermal conductivity, thermoelectric effects, etc.) – 72.15.Jf Thermoelectric and thermomagnetic effects – 74.70.Ad Metals alloys and binary compounds (including A15, Laves phases, etc.) |
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