title: Field-induced three- and two-dimensional freezing in a quantum spin liquid.
abstract: Field-induced commensurate transverse magnetic ordering is observed in the Haldane-gap compound Ni(C(5)D(14)N(2))2N(3)(PF(6)) by means of neutron diffraction. Depending on the direction of applied field, the high-field phase is shown to be either a three-dimensional ordered Néel state or a short-range ordered state with dominant two-dimensional spin correlations. The structure of the high-field phase is determined, and properties of the observed quantum phase transition are discussed.
authors: Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.
authors: Y
authors: Y
authors: Chen
authors: Z
authors: Z
authors: Honda
authors: A
authors: A
authors: Zheludev
authors: C
authors: C
authors: Broholm
authors: K
authors: K
authors: Katsumata
authors: S M
authors: SM
authors: Shapiro