The Open UniversitySkip to content
 

Diamagnetic nuclear probes in copper chromites CuCr2X4(X=O,S,Se)with a spinel structure

Dmitrieva, T; Lyubutin, I; Stepin, S; Dubinskaya, Yu; Smirnovskaya, E; Berry, Frank and Thomas, M (2007). Diamagnetic nuclear probes in copper chromites CuCr2X4(X=O,S,Se)with a spinel structure. Journal of Experimental and Theoretical Physics, 104(4) pp. 554–561.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1134/S106377610704005X
Google Scholar: Look up in Google Scholar

Abstract

The CuCr2X4 (X = O, S, Se) spinel system has been studied by the Mössbauer spectroscopy of the nuclear diamagnetic 119Sn probe at low temperatures in an external magnetic field. The hyperfine magnetic fields H Sn induced by paramagnetic ions at tin nuclei in the CuCr2S4 and CuCr2Se4 chalcogenides have giant values and are somewhat higher than those detected in the CuCr2O4 oxide. This behavior is caused by the strong covalence of the chalcogenides, which is supported by the experimentally found isomer shifts. The H Sn field is found to be mainly contributed by superexchange 90° 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 CuCr2O4 spinel, the partial contributions to the H Sn field induced by the Cu2+ and Cr3+ ions are estimated. The local magnetic structure of the CuCr2O4 spinel is refined, and its total magnetization is shown to be directed along the magnetic moment of copper in the A sublattice.

Item Type: Journal Article
ISSN: 1063-7761
Keywords: copper chromites; magnetisation
Academic Unit/Department: Science > Life, Health and Chemical Sciences
Item ID: 8136
Depositing User: Frank Berry
Date Deposited: 22 Jun 2007
Last Modified: 02 Dec 2010 20:00
URI: http://oro.open.ac.uk/id/eprint/8136
Share this page:

Actions (login may be required)

View Item
Report issue / request change

Policies | Disclaimer

© The Open University   + 44 (0)870 333 4340   general-enquiries@open.ac.uk