title: Hysteresis in random-field XY and Heisenberg models: mean-field theory and simulations at zero temperature.
abstract: We examine zero-temperature hysteresis in random-field XY and Heisenberg models in the zero-frequency limit of a cyclic driving field. Exact expressions for hysteresis loops are obtained in the mean-field approximation. These show rather unusual features. We also perform simulations of the two models on a simple-cubic lattice and compare them with the predictions of the mean-field theory.
authors.affiliation: Physics Department, North Eastern Hill University, Shillong 793 022, India. shukla@nehu.ac.in
authors.forename: Prabodh
authors.initials: P
authors.lastname: Shukla
authors.forename: R S
authors.initials: RS
authors.lastname: Kharwanlang
mesh_terms: D003198:Computer Simulation; D004574:Electromagnetic Fields; D015233:Models, Statistical; D011789:Quantum Theory; D013696:Temperature