Spin ice in a field: quasi-phases and pseudo-transitions

Details Spin ice in a field: quasi-phases and pseudo-transitions Spin ice in a field: quasi-phases and pseudo-transitions

2011-01-11

arxiv.org/abs/1101.2033v2

JETP, 113 (2011) 251-265

Physics

Condensed Matter

Materials Science

18 pages, 16 figures

Scientific paper

Thermodynamics of the short-range model of spin ice magnets in a field is considered in the Bethe - Peierls approximation. The results obtained for [111], [100] and [011] fields agrees reasonably well with the existing Monte-Carlo simulations and some experiments. In this approximation all extremely sharp field-induced anomalies are described by the analytical functions of temperature and applied field. In spite of the absence of true phase transitions the analysis of the entropy and specific heat reliefs over H-T plane allows to discern the "pseudo-phases" with specific character of spin fluctuations and define the lines of more or less sharp "pseudo-transitions" between them.

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