Abstract

Abstract NDMAZ; Ni(dmpn)2N3ClO4, dmpn=C5H14N2 is one of the closely related materials of a typical Haldane gap material NENP; Ni(en)2NO2ClO4, en=C2H8N2 both of which have almost isolated pseudo-one-dimensional Ni2+(S=1)−X chains with X=NO2 (NENP) and N3(NDMAZ), respectively. The Haldane gap energy was measured using a TOF type cold neutron spectrometer, AGNES, at temperatures from 4 to 100 K in the vicinity of the reciprocal lattice point, 001/2.

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