Title:
Thermodynamics of structurally disordered s-d model
Authors:
Yu.K.Rudavskii (National University ``Lvivska Politechnika'', 12 S.Bandera Str., 79013 Lviv, Ukraine) , | |
G.V.Ponedilok (National University ``Lvivska Politechnika'', 12 S.Bandera Str., 79013 Lviv, Ukraine) , | |
L.A.Dorosh (National University ``Lvivska Politechnika'', 12 S.Bandera Str., 79013 Lviv, Ukraine) |
Spin-electron exchange model is generalized and used for description of magnetic states of amorphous substitutional alloys with the structural disorder of the liquid type. A scheme of consistently accounting for the contributions of structural fluctuations to the thermodynamic functions and observable quantities is considered. Using the perturbation theory, the functional of thermodynamic potential is constructed as a functional power series. In the random phase approximation (RPA), the grand thermodynamic potential of the model is calculated. Self-consistency conditions are given, from which equations for magnetizations and critical temperature of the paramagnetic-ferromagnetic transition are obtained.
Key words:
s-d-model, ferromagnetic alloys, free energy,
magnetization, Curie temperature, functional integral
PACS:
72.15.C, 73.20.H, 75.10, 75.30.E, 82.65.Y
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