Eur. Phys. J. B 39, 69-76 (2004)
https://doi.org/10.1140/epjb/e2004-00172-3

Low temperature nonequilibrium dynamics in transverse Ising spin glass

¹ Dipartimento di Fisica “E.R. Caianiello”, Università di Salerno, 84081 Baronissi, Salerno and INFM, Unità di Salerno, Salerno, Italy
² Kazan State Power-Engineering University, Kazan, Russia

Corresponding author: ^a busiello@sa.infn.it

Received: 22 April 2002
Revised: 26 February 2004
Published online: 18 June 2004

Abstract

The real part of the time-dependent ac susceptibility of the short-range Ising spin glass in a transverse field has been investigated at very low temperatures. We have used the quantum linear response theory and domain coarsening ideas of quantum droplet scaling theory. It is found that after a temperature quench to a temperature T₁ (lower than the spin glass transition temperature T_g) the ac susceptibility decreases with time approximately in a logarithmic way as the system tends to the equilibrium. It is shown that the transverse field of “tunneling" has unessential effect on the nonequilibrium dynamical properties of the magnetic droplet system. The role of quantum fluctuations in the behavior of the ac susceptibility is discussed.