Mean Field Theory of a Quantum Heisenberg Spin Glass
Abstract
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.
- Publication:
-
Physical Review Letters
- Pub Date:
- July 2000
- DOI:
- 10.1103/PhysRevLett.85.840
- arXiv:
- arXiv:cond-mat/9909239
- Bibcode:
- 2000PhRvL..85..840G
- Keywords:
-
- Condensed Matter - Disordered Systems and Neural Networks;
- Condensed Matter - Statistical Mechanics;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 4 pages, LaTeX, 3 EPS figures