title: Ordering and excitations in the field-induced magnetic phase of Cs3Cr2Br9.
abstract: Field-induced magnetic order has been investigated in detail in the interacting spin 3/2 dimer system Cs3Cr2Br9. Elastic and inelastic neutron scattering measurements were performed up to H=6 T, well above the critical field H(c1) approximately 1.5 T. The ordering displays incommensurabilities and a large hysteresis before a commensurate structure is reached. This structure is fully determined. Surprisingly, the lowest excitation branch never closes. Above H(c1), the gap increases slowly with the field. An analysis in terms of projected pseudospins is given.
authors.affiliation: Département de Recherche Fondamentale sur la Matière Condensée, SPSMS, Laboratoire Magnétisme et Diffraction Neutronique, CEA-Grenoble, 38054 Grenoble cedex 9, France.
authors.forename: B
authors.initials: B
authors.lastname: Grenier
authors.forename: Y
authors.initials: Y
authors.lastname: Inagaki
authors.forename: L P
authors.initials: LP
authors.lastname: Regnault
authors.forename: A
authors.initials: A
authors.lastname: Wildes
authors.forename: T
authors.initials: T
authors.lastname: Asano
authors.forename: Y
authors.initials: Y
authors.lastname: Ajiro
authors.forename: E
authors.initials: E
authors.lastname: Lhotel
authors.forename: C
authors.initials: C
authors.lastname: Paulsen
authors.forename: T
authors.initials: T
authors.lastname: Ziman
authors.forename: J P
authors.initials: JP
authors.lastname: Boucher