Abstract
Abstract We measured the magnetic susceptibility χ(T) of the Haldane compound Ni(C2H8O4)2NO2(ClO4) (NENP) under hydrostatic pressure P. With increase of the pressure, the system tends to change from the O(2) symmetry to the SU(2) symmetry, similarly to the results of neutron scattering experiment under hydrostatic pressure by Zaliznyak et al. (Phys. Rev. B 57 (1998) 5200). Within our experimental range of hydrostatic pressure up to about 1 GPa , we did not observe any anomaly indicating the three-dimensional magnetic long range ordering and the quantum phase transition.
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