title: Critical hysteresis in random-field XY and Heisenberg models.
abstract: We study zero-temperature hysteresis in random-field XY and Heisenberg models in the zero-frequency limit of a cyclic driving field. We consider three distributions of the random field and present exact solutions in the mean-field limit. The results show a strong effect of the form of disorder on critical hysteresis as well as the shape of hysteresis loops. A discrepancy with an earlier study based on the renormalization group is resolved.
authors.affiliation: Physics Department, North Eastern Hill University, Shillong, India. shukla@nehu.ac.in
authors.forename: Prabodh
authors.initials: P
authors.lastname: Shukla
authors.forename: R S
authors.initials: RS
authors.lastname: Kharwanlang