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Bengrine, M.; Benyoussef, A.; Ez-Zahraouy, H.; Mhirech, F.
Abdus Salam International Centre for Theoretical Physics, Trieste (Italy)1998
Abdus Salam International Centre for Theoretical Physics, Trieste (Italy)1998
AbstractAbstract
[en] The effects of amorphized film and diluted surface on phase diagrams and magnetic properties of a spin-1/2 Ising film are investigated within a finite cluster approximation. Depending on the value of the concentration p of the dilution couplings at the surface, it is found that there exists a critical value pc, when increasing the thickness of the film the critical temperature Tc decreases for p greater than pc, while it increases for p less than pc. Moreover, the critical concentration depends on the amorphization δ. Indeed, pc increasing with increasing δ. Besides, the phase diagram represented in (Tc,α), where α represents the strength of the strong coupling at the surface, shows that there exists a critical value of the amorphization δc=δc(p) for p not= 1, for δ≤δc(p) a long range order occurs for any value of α at low temperature, while for δ>δc(p) an order-disorder transition occurs at T=0 and α=αc(δ). Magnetization is calculated as a function of the amorphization δ, the concentration p and the strength α of the strong coupling. (author)
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Sep 1998; 24 p; 28 refs, 7 figs
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