Open AccessElectron spin resonance studies of some cuprate(II)systems
Author(s) -
A. Robert Armstrong,
Robert R. Janes,
K.K. Singh,
P.P. Edwards
Publication year - 1991
Publication title -
bulletin of materials science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.35
H-Index - 72
eISSN - 0973-7669
pISSN - 0250-4707
DOI - 10.1007/bf02744699
Subject(s) - cuprate , electron paramagnetic resonance , copper , materials science , ternary operation , resonance (particle physics) , crystallography , oxygen , spin (aerodynamics) , planar , electron , doping , condensed matter physics , nuclear magnetic resonance , physics , atomic physics , chemistry , thermodynamics , organic chemistry , computer graphics (images) , optoelectronics , quantum mechanics , computer science , metallurgy , programming language
The electron spin resonance (ESR) of a number of ternary oxides of copper (II) has been studied at both 77 K and 300 K. Materials investigated include those which might be considered 1-dimensional analogues of La2CuO4, namely A2CuO3 (A=Ca,Sr, Ba) plus the related material SrCuO2. The two oxygen rich derivatives of Ba2CuO3 have also been studied in view of their different oxygen environments around copper. Also other alkaline earth cuprates such as the recently described Sr14Cu24O41-x and Bi2Cu2O5, both pure and doped with Sr2+ are included. Compounds containing extended Cu-O chains are found to be essentially ESR silent both at room temperature and 77 K, regardless of whether the chains are one-dimensional or form two-dimensional sheets as in Ca(Sr)CuO2. In Sr14Cu24O41-x, which contains both Cu-O chains and chains of edge-shared CuO4 square-planar units there is an asymmetric signal which sharpens on cooling. © 1991 Indian Academy of Sciences
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