Diamagnetic nuclear {sup 119}Sn probes in the copper chromites CuCr{sub 2}X{sub 4} (X = O, S, Se) with a spinel structure

Journal Article · Sun Apr 15 04:00:00 EDT 2007 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S106377610704005X· OSTI ID:21072500

Dmitrieva, T V; Stepin, A S; Dubinskaya, Yu L; Smirnovskaya, E M ^[1]; Berry, F J ^[2]; Thomas, M F ^[3]

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1. Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation)
2. The Open University (United Kingdom)
3. 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, Journal Name: Journal of Experimental and Theoretical Physics Journal Issue: 4 Vol. 104; ISSN JTPHES; ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHROMITES
CHROMIUM IONS
COPPER
COPPER COMPOUNDS
COPPER IONS
ISOMER SHIFT
MAGNETIC FIELDS
MAGNETIC MOMENTS
MAGNETIZATION
MOESSBAUER EFFECT
OXIDES
PARAMAGNETISM
SPINELS
TIN 119