Field-induced three- and two-dimensional freezing in a quantum spin liquid.
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.
Chen
Y
Y
Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.
Honda
Z
Z
Zheludev
A
A
Broholm
C
C
Katsumata
K
K
Shapiro
S M
SM