Modeling the thermopower of icosahedral Al_(63)Cu_(25)Fe_(12) quasicrystals: spectral fine structure
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2004
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American Physical Society
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Abstract
On the basis of a realistic model for the spectral conductivity, obtained from a proper combination of tunneling spectroscopy [R. Escudero , J. Phys.: Condens. Matter 11, 383 (1999)] and transport measurements, we derive a closed analytical expression for the Seebeck coefficient, satisfactorily describing its temperature dependence over a wide temperature range. The relative importance of thermal broadening effects and the temperature dependence of chemical potential in the thermopower curve is quantitatively discussed. By comparing the obtained analytical results with the experimental S(T) curve evidence for band structure effects in the thermopower is reported.
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©2004 The American Physical Society.
I warmly thank Professor R. Escudero for sharing his experimental data files and for fruitful discussions. I also thank Professor H. Solbrig for enlightening discussions. I am indebted to Dr. C. V. Landauro for interesting conversations and for sharing useful materials. I acknowledge M. V. Hernández for a critical reading of the manuscript. This work is supported by UCM through Project No. PR3/04-12450.