title: Solid phases in electro- and magnetorheological systems.
abstract: Ensembles of particles with a spherically symmetric repulsive Yukawa interaction and additional dipole-dipole interaction induced by an external field exhibit numerous solid-solid phase transitions controlled by the magnitude of the field. Such interactions emerge most notably in electro- and magnetorheological fluids and plasmas. We propose a simple variational approach based on the Bogoliubov inequality for determining equilibrium solid phases. Phase diagrams for several regimes are calculated and compared with previously performed Monte Carlo and molecular dynamics simulations.
authors.affiliation: Max-Planck-Institut für extraterrestrische Physik, 85741 Garching, Germany. brandt@mpe.mpg.de
authors.forename: Philip C
authors.initials: PC
authors.lastname: Brandt
authors.forename: Alexei V
authors.initials: AV
authors.lastname: Ivlev
authors.forename: Gregor E
authors.initials: GE
authors.lastname: Morfill