Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9834303 | Journal of Magnetism and Magnetic Materials | 2005 | 4 Pages |
Abstract
We report structural and magnetic data of a new transition metal oxide InCu2/3V1/3O3 containing hexagonal planes of magnetic Cu2+ (S=12) 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 Jâ¼140Â K and form a two-dimensional S=12-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 x2-y2 orbital as in copper oxides with the usual octahedral, square-pyramidal or square-planar coordination, but it is the 3z2-r2 orbital, which is unique for the cuprates.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
V. Kataev, A. Möller, U. Löw, W. Jung, N. Schittner, M. Kriener, A. Freimuth,