Publication: Thermoelectric properties of icosahedral quasicrystals: a phenomenological approach
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2003-01-15
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American Institute of Physics
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Abstract
In this work, we introduce a phenomenological model describing the thermoelectric power of icosahedral quasicrystals. On the basis of a realistic model for the spectral conductivity, obtained from ab initio band-structure calculations [C. Landauro and H. Solbrig, Physica B 301, 267 (2000)], we derive a closed analytical expression for the Seebeck coefficient, satisfactorily describing its temperature dependence S(T) over a wide temperature range. We introduce four phenomenological coefficients relating the electronic structure to characteristic features of the experimental S(T) curves. By comparing our analytical results with available experimental data we relate the sensitivity of the thermopower curve to minor variations in the chemical composition to a systematic shift of the Fermi-level position.
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© 2003 American Institute of Physics.
The author warmly thanks C. Berger, J. M. Dubois, R. Escudero, T. Grenet, P. Häussler, C. Landauro, U. Mizutani, S. Roche, Z. M. Stadnik, and P. A. Thiel for interesting conversations and for sharing useful materials. The author acknowledges K. Giannò, A. L. Pope, and T. M. Tritt for sharing information and M. V. Hernández for a critical reading of the manuscript. This work is supported by the Consejería de Educación de la CAM and European Union FEDER through Project No. 07N/0070/2001.