Compressible Sherrington-Kirkpatrick spin-glass model
نویسندگان
چکیده
Abstract. We introduce a Sherrington-Kirkpatrick spin-glass model with the addition of elastic degrees of freedom. The problem is formulated in terms of an effective four-spin Hamiltonian in the pressure ensemble, which can be treated by the replica method. In the replica-symmetric approximation, we analyze the pressuretemperature phase diagram, and obtain expressions for the critical boundaries between the disordered and the ordered (spin-glass and ferromagnetic) phases. The secondorder para-ferromagnetic border ends at a tricritical point, beyond which the transition becomes discontinuous.
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