title: Competing magnetic phases on a kagomé staircase.
abstract: We present thermodynamic and neutron data on Ni3V2O8, a spin-1 system on a kagomé staircase. The extreme degeneracy of the kagomé antiferromagnet is lifted to produce two incommensurate phases at finite T--one amplitude modulated, the other helical--plus a commensurate canted antiferromagnet for T-->0. The H-T phase diagram is described by a model of competing first and second neighbor interactions with smaller anisotropic terms. Ni3V2O8 thus provides an elegant example of order from subleading interactions in a highly frustrated system.
authors.affiliation: Los Alamos National Laboratory, Los Alamos, NM 87544, USA.
authors.forename: G
authors.initials: G
authors.lastname: Lawes
authors.forename: M
authors.initials: M
authors.lastname: Kenzelmann
authors.forename: N
authors.initials: N
authors.lastname: Rogado
authors.forename: K H
authors.initials: KH
authors.lastname: Kim
authors.forename: G A
authors.initials: GA
authors.lastname: Jorge
authors.forename: R J
authors.initials: RJ
authors.lastname: Cava
authors.forename: A
authors.initials: A
authors.lastname: Aharony
authors.forename: O
authors.initials: O
authors.lastname: Entin-Wohlman
authors.forename: A B
authors.initials: AB
authors.lastname: Harris
authors.forename: T
authors.initials: T
authors.lastname: Yildirim
authors.forename: Q Z
authors.initials: QZ
authors.lastname: Huang
authors.forename: S
authors.initials: S
authors.lastname: Park
authors.forename: C
authors.initials: C
authors.lastname: Broholm
authors.forename: A P
authors.initials: AP
authors.lastname: Ramirez