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Prog. Theor. Phys. Vol. 68 No. 2 (1982) pp. 374-387

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Freeze-In Transition of Anharmonic Oscillator System with Quenched Random Interactions

Shinji Nambu and Shigeo Naya

Department of Physics, Kwansei Gakuin University, Uegahara, Nishinomiya 662

(Received February 1, 1982)

Abstract:

A simple model of strongly disordered systems composed of anharmonic oscillators with quenched random interactions is introduced and its structural phase transition is studied by making use of the replica method. A freeze-in transition characterized by Edwards and Anderson type's order prameter (q ≠0), the phase diagram (para-ferrodistortive-frozen), and a constant susceptibility below the transition temperature are derived in the mean field (Einstein oscillator) approximation. The self-consistent phonon approximation is also used to study the effect of spatial fluctuations, and it is shown that the phase diagram undergoes a qualitative change at the spatial dimension d=4. The relationship between our model and the Ginzburg-Landau theory of spin-glasses are discussed.


URL : http://ptp.ipap.jp/link?PTP/68/374/
DOI : 10.1143/PTP.68.374

[ Full Text PDF : FREE ACCESS (506K) ] Citation:


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Citing Article(s) :

  1. Progress of Theoretical Physics Vol. 70 No. 3 (1983) pp. 871-874 :
    Stability of the Ginzburg-Landau Spin-Glass Model
    Shinji Nambu