65 research outputs found
Low temperature linear dynamical susceptibility of dipolar spin glasses
No full textThe dissipative part of the linear magnetic dynamic susceptibility of dipolar spin glasses is considered. Due to the transition of the system (at enough high concentration of the magnetic dipoles) from a paramagnetic phase to a magnetic dipolar one, an anomalous temperature dependence of the dissipative part of the magnetic susceptibility is found. Some considerations related to the experimental results for LiHoxY 1−xF4 are made
Linear dynamical susceptibility of Ising spin glass in the transverse field at low temperature
No full text
Low temperature nonequilibrium dynamics in transverse Ising spin glass
No full textThe 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 Tg) 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
Zero-temperature nonequilibrium dynamics of the spherical Scherrington-Kirkpatrick model of a spin glass in an external field
No full text- …
