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- W2108403960 abstract "The authors discuss the effects of thermal fluctuations, quantum fluctuations and quenched fluctuations on a triangular Ising-Heisenberg antiferromagnet. Although thermal fluctuations of the quadratic order (in spin-wave expansions) are found to preserve the continuous ground-state degeneracy, higher-order spin-wave calculations show that thermal fluctuations lift the ground-state degeneracy. Long-wavelength thermal fluctuations are found to be dominant in the thermal selection. Thermal fluctuations and quantum fluctuations select states with different spin directions within the ground-state manifold. The authors conjecture that this competition leads to a first-order phase transition. Due to the symmetry-breaking fields introduced by the thermal/quantum fluctuations, they expect there to be another Kosterlitz-Thouless (KT) phase transition (T6) below which the system is locked into one of the discretely selected states, in addition to the two KT transitions (T(N)1 and T(N)2) found by Miyashita and Kawamura. Random site dilutions affect the system the way the discrete random anisotropy field affects an XY ferromagnet. Two KT transitions (T(N)1 and T6) are destroyed as real phase transitions at the appearance of the random site dilutions, but T(N)2 is unaffected." @default.
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- W2108403960 date "1992-03-16" @default.
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- W2108403960 title "Ordering due to disorder in a triangular Heisenberg antiferromagnet with exchange anisotropy" @default.
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- W2108403960 doi "https://doi.org/10.1088/0953-8984/4/11/020" @default.
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