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On the Critical Behaviour and Phase Diagram of Ising-like Metamagnet in a Transverse Field

100%
Lukierska-Walasek K.
|
EN
The quantum Ising-like metamagnet in a field Γ perpendicular to the easy direction in the mean field approximation is investigated. The conditions for the existence of critical and tricritical points have been analyzed. The result is illustrated by an appropriate plot in three-dimensional space of the following parameters: the temperature, Γ, and field parallel to the easy direction.
2
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Cavity Fields Approach to Simple Pseudospin Model of Orientational Glass

51%
De Cesare L., Lukierska-Walasek K., Rabuffo I., Walasek K.
Acta Physica Polonica A
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1997
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vol. 92
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issue 2
411-414
EN
A simple infinite-range model of axial quadrupolar glass is investigated within the cavity-fields approach inside a pure state and a cluster of pure states. Working at a level of a pure state, the nonlinear susceptibility is derived. When a cluster of pure states is considered, all the known results of the one-step replica-symmetry breaking approach are easily reproduced. Besides, the nonlinear susceptibility and the stability conditions are obtained and related numerical results are presented. In this way the stability range of the replica-symmetry breaking solution, quite difficult to be derived within the replica method, is established on the purely physical ground. An interesting feature is that, at any considered stage, the nonlinear susceptibility diverges at a given temperature T_{c} where the quadrupolarization and the quadrupolar glass order parameters are nonzero and finite. This may be interpreted as a signal of a glassy phase transition not in the Landau sense.
3
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Replica-Symmetry Broken Solution of Simple Pseudospin Model of Orientational Glass

51%
Walasek K., Lukierska-Walasek K., Wodawski M.
Acta Physica Polonica A
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1997
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vol. 92
|
issue 2
407-410
EN
The first stage of the replica-symmetry breaking for a simple quadrupolar glass model using the Parisi ansatz has been performed in a wide range of temperatures including T = 0. It has been obtained that the entropy of the system increases considerably compared to that calculated within the replica symmetric theory.
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