Volume 59, Number 2, July 2002
|Page(s)||277 - 283|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 July 2002|
Ferromagnetic transition in a double-exchange system containing impurities in the Dynamical Mean-Field Approximation
Department of Electrical and Computer Engineering
Ben-Gurion University of the Negev - P.O. Box 653,
Beer-Sheva, 84105 Israel
2 Jack and Pearl Resnick Institute of Advanced Technology Department of Physics, Bar-Ilan University - Ramat-Gan 52900, Israel
Accepted: 24 April 2002
We formulate the Dynamical Mean-Field Approximation equations for the double-exchange system with quenched disorder for arbitrary relation between Hund exchange coupling and electron bandwidth. Close to the ferromagnetic-paramagnetic transition point the DMFA equations can be reduced to the ordinary mean-field equation of Curie-Weiss type. We solve the equation to find the transition temperature and present the magnetic phase diagram of the system.
PACS: 75.10.Hk – Classical spin models / 75.30.Mb – Valence fluctuation, Kondo lattice, and heavy-fermion phenomena / 75.30.Vn – Colossal magnetoresistance
© EDP Sciences, 2002
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