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Site-diluted quantum Heisenberg spin model applied to the magnetic properties of Fe–Al disordered alloys |
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| Authors: | M Salazar Ligia E Zamora G A Prez Alcazar J A Plascak W R Aguirre |
| Institution: | a Departamento de Física, Universidad del Valle, A. A. 25360, Cali, Colombia b Departamento de Física, Universidad Federal de Minas Gerais, C.P. 602 Belo Horizonte, Brazil c Departamento de Ciencias Básicas, Pontificia Universidad Javeriana, A. A. 26239, Cali, Colombia |
| Abstract: | In this work we present a theoretical study of the magnetic behavior of disordered Fe–Al alloys on the basis of a simple-diluted quantum Heisenberg spin model with the assumption that the exchange interaction J depends on the Al concentration q. We calculated the critical temperature and exponents through the mean field renormalization group method. An acceptable fit to the experimental phase diagram for Al concentration in the range 0.30 q0.45 is obtained. |
| Keywords: | Fe–Al alloys Heisenberg model Dilution |
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