QUANTUM-CLASSICAL PHASE TRANSITION OF THE ESCAPE RATE OF TWO-SUBLATTICE ANTIFERROMAGNETIC LARGE SPINS
2014 ◽
Vol 28
(03)
◽
pp. 1450008
Keyword(s):
The Hamiltonian of a two-sublattice antiferromagnetic spins, with single (hard-axis) and double ion anisotropies described by [Formula: see text] is investigated using the method of effective potential. The problem is mapped to a single particle quantum-mechanical Hamiltonian in terms of the relative coordinate and reduced mass. We study the quantum-classical phase transition of the escape rate of this model. We show that the first-order phase transition for this model sets in at the critical value Jc = (Kc+Jz, c)/2 while for the anisotropic Heisenberg coupling [Formula: see text] we obtain Jc = (2Kc-Jz, c)/3. The phase diagrams of the transition are also studied.
2013 ◽
Vol 28
(28)
◽
pp. 1350140
◽
Keyword(s):
Keyword(s):
1990 ◽
Vol 167
(3-4)
◽
pp. 388-394
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1989 ◽
Vol 71
(1)
◽
pp. 45-48
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1982 ◽
Vol 67
(3)
◽
pp. 787-803
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