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

Thermodynamics of a 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 agree reasonably well with the existing Monte Carlo simulations and some experiments. In this approximation, all extremely sh...

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Bibliographic Details
Published in:Journal of experimental and theoretical physics 2011-08, Vol.113 (2), p.251-265
Main Author: Timonin, P. N.
Format: Article
Language:English
Subjects:
Analysis
ANALYTIC FUNCTIONS
APPROXIMATIONS
Classical and Quantum Gravitation
COMPUTERIZED SIMULATION
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTAL FIELD
CRYSTAL STRUCTURE
Disorder
Elementary Particles
ENTROPY
FLUCTUATIONS
MAGNETS
MONTE CARLO METHOD
Order
Particle and Nuclear Physics
PHASE TRANSFORMATIONS
Phase Transition in Condensed System
Physics
Physics and Astronomy
Quantum Field Theory
Relativity Theory
Solid State Physics
SPECIFIC HEAT
SPIN
TEMPERATURE DEPENDENCE
THERMODYNAMICS
Toy industry
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Summary:Thermodynamics of a 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 agree reasonably well with the existing Monte Carlo simulations and some experiments. In this approximation, all extremely sharp field-induced anomalies are described by analytic functions of temperature and the applied field. In spite of the absence of true phase transitions, the analysis of the entropy and specific heat reliefs over the H - T plane allows discerning “pseudo-phases” with a specific character of spin fluctuations and defining the lines of relatively sharp “pseudo-transitions” between them.
ISSN:1063-7761
1090-6509
DOI:10.1134/S1063776111080115