Mean-Field Theory of a Quantum Heisenberg Spin Glass

Details Mean-Field Theory of a Quantum Heisenberg Spin Glass Mean-Field Theory of a Quantum Heisenberg Spin Glass

1999-09-16

arxiv.org/abs/cond-mat/9909239v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, LaTeX, 3 EPS figures

Scientific paper

10.1103/PhysRevLett.85.840

A full mean field solution of a quantum Heisenberg spin glass model is presented in a large-N limit. A spin glass transition is found for all values of the spin S. The quantum critical regime associated with the quantum transition at S=0, and the various regimes in the spin glass phase at high spin are analyzed. The specific heat is shown to vanish linearly with temperature. In the spin-glass phase, intriguing connections between the equilibrium properties of the quantum problem and the out-of-equilibrium dynamics of classical models are pointed out.

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