Benyoussef, A. and Boubekri, A. and Ez-Zahraouy, H. and Saber, M. (1999) The semi-infinite anisotropic spin-1/2 Heisenberg ferromagnet. Chinese Journal of Physics, 37 (1). pp. 89-97.

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Using the effective field theory with a probability distribution technique that accounts for the self-spin correlation functions, the phase transitions in the semi-infinite anisotropic spin-1/2 Heisenberg ferromagnet on a simple cubic lattice are examined. For fixed values of the reduced exchange anisotropic parameter, the critical temperature of the system is studied as a function of the ratio R of the surface exchange couplings to the bulk ones. It was found that if R ≤ Rc, the system orders at the bulk critical temperature TcB/J and if R ≥ RC) the system exhibits two successive transitions. The surface orders at the surface critical temperature TcS/J which is higher than TcB/J and as the temperature is lowered, in the presence of an ordered surface, the bulk orders at TcB/J. © 1999 The Physical Society of the Republic of China.

Item Type: Article
Subjects: Physics and Astronomy
Divisions: SCIENTIFIC PRODUCTION > Physics and Astronomy
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:49

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