Open AccessElectron diffraction study of La{sub 2}Li{sub O.5}Cu{sub O.5}O{sub 4}
Author(s) -
E. Moshopoulou,
J. D. Thompson,
J.L. Sarrao,
Z. Fisk
Publication year - 1998
Publication title -
osti oai (u.s. department of energy office of scientific and technical information)
Language(s) - English
Resource type - Reports
DOI - 10.2172/658351
Subject(s) - electron diffraction , crystallography , diffraction , chemistry , lattice (music) , crystal structure , singlet state , excitation , x ray crystallography , electron , condensed matter physics , atomic physics , physics , optics , excited state , quantum mechanics , acoustics
La{sub 2}Li{sub 0.5}Cu{sub 0.5}O{sub 4} has been investigated by electron diffraction and high resolution electron microscopy at room temperature. Ordering between Li and Cu cations is fairly perfect within the ({anti a}, {anti c}) plane but there is disorder between Cu and Li cations along the {anti b} axis. The detection of weak reflections which violate the C centering of the Cmmm space group (initially proposed for this compound), indicates that the crystal symmetry allows lattice distortions. The evolution of the structure as a function of the temperature may lead to determine whether the low energy singlet-triplet excitation, found in NMR/NQR studies, is coupled with lattice distortions
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