Behavior of Ising spin glasses in a magnetic field |
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Authors: | Jörg Thomas Katzgraber Helmut G Krzakała Florent |
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Affiliation: | LPTMS, UMR 8626 CNRS et Université Paris-Sud, Orsay Cedex, France. |
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Abstract: | We study the existence of a spin-glass phase in a field using Monte Carlo simulations performed along a nontrivial path in the field-temperature plane that must cross any putative de Almeida-Thouless instability line. The method is first tested on the Ising spin glass on a Bethe lattice where the instability line separating the spin glass from the paramagnetic state is also computed analytically. While the instability line is reproduced by our simulations on the mean-field Bethe lattice, no such instability line can be found numerically for the short-range three-dimensional model. |
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