Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 290, Issue -, Pages 310-313Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2004.11.204
Keywords
low-dimensional magnetism; magnetic susceptibility; quantum Monte-Carlo; ESR
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We report structural and magnetic data of a new transition metal oxide InCu2/3V1/3O3 containing hexagonal planes of magnetic Cu2+ (S = 1/2) ions in a 5-fold trigonal-bipyramidal coordination of oxygen ions. Static magnetic susceptibility and electron spin resonance (ESR) data as well as numerical quantum Monte-Carlo calculations suggest that Cu spins in the layers are strongly antiferromagnetically coupled with J similar to 140 K and form a two-dimensional S = 1/2-Heisenberg honeycomb lattice. Owing to the appreciable interlayer coupling the compound orders magnetically at 38K. Remarkably, ESR gives evidence that the orbital ground state of Cu2+ is not the x(2) - y(2) orbital as in copper oxides with the usual octahedral, square-pyramidal or square-planar coordination, but it is the 3z(2) - r(2) orbital, which is unique for the cuprates. (c) 2004 Elsevier B.V. All rights reserved.
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