Diamagnetic nuclear {sup 119}Sn probes in the copper chromites CuCr{sub 2}X{sub 4} (X = O, S, Se) with a spinel structure
- Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation)
- The Open University (United Kingdom)
- University of Liverpool (United Kingdom)
The CuCr{sub 2}X{sub 4} (X = O, S, Se) spinel system has been studied by the Moessbauer spectroscopy of the nuclear diamagnetic {sup 119}Sn probe at low temperatures in an external magnetic field. The hyperfine magnetic fields H{sup Sn} induced by paramagnetic ions at tin nuclei in the CuCr{sub 2}S{sub 4} and CuCr{sub 2}Se{sub 4} chalcogenides have giant values and are somewhat higher than those detected in the CuCr{sub 2}O{sub 4} oxide. This behavior is caused by the strong covalence of the chalcogenides, which is supported by the experimentally found isomer shifts. The H{sup Sn} field is found to be mainly contributed by superexchange 90{sup o} interactions in the B-sublattice along the Cr[B]-X-Sn[B] bond chain, whose role increases in the series O-S-Se. In the oxygen CuCr{sub 2}O{sub 4} spinel, the partial contributions to the H{sup Sn} field induced by the Cu{sup 2+} and Cr{sup 3+} ions are estimated. The local magnetic structure of the CuCr{sub 2}O{sub 4} spinel is refined, and its total magnetization is shown to be directed along the magnetic moment of copper in the A sublattice.
- OSTI ID:
- 21072500
- Journal Information:
- Journal of Experimental and Theoretical Physics, Vol. 104, Issue 4; Other Information: DOI: 10.1134/S106377610704005X; Copyright (c) 2007 Nauka/Interperiodica; Article Copyright (c) 2007 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7761
- Country of Publication:
- United States
- Language:
- English
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