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Reentrant behaviour in Ising models with biquadratic exchange interaction (1986)

Alcantara Bonfim, O. F. ; Obcemea, C. H.

Springer

The European physical journal 64 (1986), S. 469-471

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ISSN: 1434-6036

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract The critical behaviour for the spin-1 Ising model with biquadratic interaction is investigated in two and three dimensions using the Monte Carlo method. The phase diagram for the three-dimensional system exhibits a reentrant behaviour for large positive values of the biquadratic exchange coupling. The temperature dependence of magnetization and susceptibility in the reentrant region is also presented.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01312841

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Analytic perturbation theory and localization phenomena (1979)

Brändas, E. J. ; Obcemea, C. H.

New York, NY : Wiley-Blackwell

International Journal of Quantum Chemistry 16 (1979), S. 993-1007

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ISSN: 0020-7608

Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: This paper attempts to apply the results of analytic perturbation theory to systems exhibiting some degree of randomness in their state variables. In particular, we focus on the localization problem in the Anderson model. It is shown that this approach proves the existence of bound states as a result of the statistical treatment of the Weinberg-van Winter-Hunziker irreducible N-particle kernel. The analysis is extended beyond the one-particle cluster approach and the occurrence of higher-order clusters is discussed in relation to the diluteness criterion and the conditions set on the interaction potential V.