Antisymmetric and Anisotropic Exchange as Studied by EPR in a Molecular Composite [NH3-(CH2)2-NH3]CuCl4

Autor: Ridha Zouari, J.-Cl. Bissey, N. B. Chanh, Pierre Béziade, Abdelaziz Daoud, Nathalie Filloleau
Rok vydání: 1997
Předmět:
Zdroj: physica status solidi (b). 201:505-513
ISSN: 1521-3951
0370-1972
DOI: 10.1002/1521-3951(199706)201:2<505::aid-pssb505>3.0.co;2-2
Popis: The monoclinic crystal structure of [NH 3 -(CH 2 ) 2 -NH 3 (CuCl 4 consists of two-dimensional (b, c) layers of square planar (CuCl 4 ) 2- entities, separated from each other by [NH 3 -(CH 2 ) 2 -NH 3 ] 2+ alkylene chain sheets. Electron Paramagnetic Resonance (EPR) data have been obtained in single crystals of 2C 2 CuCl 4 when rotated around a*, b and c -axes, at X-band. Only one EPR exchange-collapsed line was observed for the two magnetically inequivalent copper ions in the lattice. The angular variation of its position and peak-to-peak linewidth were measured in three perpendicular planes. A careful analysis of experimental data permits to obtain the principal values of the g-factor g 1 = 2.053, g = 2.274. The contributions to the linewidths were analyzed in terms of the antisymmetric exchange (d) and the anisotropic exchange (D) and yielded |d x /d y | = 0.92 and |(d z 2 + 2.2D 2 ) 1/2 /dy| = 0.65. Lineshape studies show that the exchange between the two inequivalent copper ions is anisotropic.
Databáze: OpenAIRE
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