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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/5488

Title: Large magnetoresistance and charge transfer between the conduction and magnetic electrons in layered oxyselenide BiOCu0.96Se
Authors: Karna, SK
Hung, CH
Wu, CM
Wang, CW
Li, WH
Sankar, R
Chou, FC
Avdeev, M
Keywords: BONDING
VALENCE
SUPERCONDUCTIVITY
NEUTRONS
NEUTRON DIFFRACTION
X-RAY DIFFRACTION
Issue Date: 1-Jan-2013
Publisher: ROYAL SOCIETY OF CHEMISTRY
Citation: Karna, S.K., Hung, C. H., Wu, C. M., Wang, C. W., Li, W. H., Sankar, R., Chou, F. C., & Avdeev, M. (2013). Large magnetoresistance and charge transfer between the conduction and magnetic electrons in layered oxyselenide BiOCu0.96Se. Dalton Transactions, 42(44), 15581-15590.
Abstract: The electrical and magnetic properties of slightly Cu-deficient BiOCu0.96Se have been investigated using neutron and X-ray diffraction, ac magnetic susceptibility, magnetization and electric resistivity measurements. The layered BiOCu0.96Se crystallizes into a tetragonal lattice with a P4/nmm symmetry. Thermal profiles of the electrical resistivity reveal a semiconductor type behavior, but depart from its course at low temperatures when antiferromagnetic coupling becomes thermally loosened at 140 K. Positive magnetoresistances are obtained at all temperatures studied. With an applied magnetic field of 0.5 kOe, the magnetoresistance reaches 235% at 2 K. It decreases with increasing temperature, but stabilizes to 70% above 60 K. Both ferromagnetic and antiferromagnetic coupling are detected between the Cu spins in the SeCu4 pyramidal blocks, which results in a non-collinear spin arrangement at low temperatures. The antiferromagnetic component becomes disordered above TN = 140 K, whereas the ferromagnetic moment persists up to TC = 300 K. Interlayer charge transfer between the conduction and magnetic electrons gives rise to an anomaly in the magnetic order parameter. © 2013, Royal Society of Chemistry.
URI: http://dx.doi.org/10.1039/c3dt52245h
http://apo.ansto.gov.au/dspace/handle/10238/5488
ISSN: 1477-9226
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