Ising Spin Glass in a Transverse Magnetic Field

Details Ising Spin Glass in a Transverse Magnetic Field Ising Spin Glass in a Transverse Magnetic Field

1993-12-08

arxiv.org/abs/cond-mat/9312036v1

Physics

Condensed Matter

7 pages, RevTeX3, Nota Cientifica PUC-Rio 23/91

Scientific paper

10.1103/PhysRevB.49.6404

We study the three-dimensional quantum Ising spin glass in a transverse magnetic field following the evolution of the bond probability distribution under Renormalisation Group transformations. The phase diagram (critical temperature $T_c$ {\em vs} transverse field $\Gamma$) we obtain shows a finite slope near $T=0$, in contrast with the infinite slope for the pure case. Our results compare very well with the experimental data recently obtained for the dipolar Ising spin glass LiHo$_{0.167}$Y$_{0.833}$F$_4$, in a transverse field. This indicates that this system is more apropriately described by a model with short range interactions than by an equivalent Sherrington-Kirkpatrick model in a transverse field.

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