Dynamic nonlinear (cubic) susceptibility in quantum Ising spin glass

Details Dynamic nonlinear (cubic) susceptibility in quantum Ising spin glass Dynamic nonlinear (cubic) susceptibility in quantum Ising spin glass

2002-03-25

arxiv.org/abs/cond-mat/0203501v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

15 pages, 3 figures

Scientific paper

10.1016/S0038-1098(02)00219-3

Dynamic nonlinear (cubic) susceptibility in quantum d-dimensional Ising spin glass with short-range interactions is investigated on the basis of quantum droplet model and quantum-mechanical nonlinear response theory. Nonlinear response depends on the tunneling rate for a droplet which regulates the strength of quantum fluctuations. It shows a strong dependence on the distribution of droplet free energies and on the droplet length scale average. Comparison with recent experiments on quantum spin glasses like disordered dipolar quantum Ising magnet is discussed.

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