On the scaling and ageing behaviour of the alternating susceptibility in spin glasses and local scale invariance

The frequency-dependent scaling of the dispersive and dissipative parts of the alternating susceptibility is studied for spin glasses at criticality. An extension of the usual ωt-scaling is proposed. Simulational data from the three-dimensional Ising spin glass agree with this new scaling form and moreover reproduce well the scaling functions explicitly calculated for systems satisfying local scale invariance. There is also a qualitative agreement with existing experimental data.