ESR study of exchange coupled pairs in copper diethyldithiocarbamate

Kumari Cowsik, R. ; Srinivasan, R. (1973) ESR study of exchange coupled pairs in copper diethyldithiocarbamate Pramana - Journal of Physics, 1 (4). pp. 177-187. ISSN 0304-4289

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ESR investigations on exchange coupled pairs of Cu ions in single crystals of Cu(dtc)2, isomorphously diluted with the corresponding diamagnetic zinc salt, are reported. The spin Hamiltonian parameters for the coupled species (S=1) are: g=2.1025, g=2.031, A=75.1×10-4 cm-1, B=14.8×10-4, D=276.0×10-4 cm-1 and E=46.7×10-4 cm-1. While the g and A tensors show tetragonal symmetry, the zeor-field splitting tensor is rhombic and has principal axes different from those of the g and A tensors. Intensity measurements made down to 4.2 K indicate that the exchange is ferromagnetic with |F|~10 cm-1. Direct dipole-dipole interaction appears to be the major contribution to the zero-field splitting. A calculation on the distributed point dipole model shows that dipolar interaction is considerably modified by the high covalency of the Cu-S bond and accounts for the rhombic nature of the tensor. The possible exchange mechanisms in Cu(dtc)2-direct exchange and superexchange through the bridging sulphurs-are discussed.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Exchange Interaction; ESR; Copper Diethyldithiocarbamate
ID Code:36827
Deposited On:11 Apr 2011 13:32
Last Modified:17 May 2016 19:45

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