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Development of the magnetic excitations of charge-stripe ordered La2−xSrxNiO4 on doping towards checkerboard charge order

The magnetic excitation spectrums of charge stripe ordered La 2− x Sr x NiO 4 x = 0.45 and x = 0.4 were studied by inelastic neutron scattering. We found the magnetic excitation spectrum of x = 0.45 from the ordered Ni 2+ S = 1 spins to match that of checkerboard charge ordered La 1.5 Sr 0.5 NiO 4 ....

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Bibliographic Details
Published in:Journal of the Korean Physical Society 2013, 62(10), , pp.1453-1457
Main Authors: Freeman, P. G., Giblin, S. R., Hradil, K., Mole, R. A., Prabhakaran, D.
Format: Article
Language:English
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Summary:The magnetic excitation spectrums of charge stripe ordered La 2− x Sr x NiO 4 x = 0.45 and x = 0.4 were studied by inelastic neutron scattering. We found the magnetic excitation spectrum of x = 0.45 from the ordered Ni 2+ S = 1 spins to match that of checkerboard charge ordered La 1.5 Sr 0.5 NiO 4 . The distinctive asymmetry in the magnetic excitations above 40meV was observed for both doping levels, but an additional ferromagnetic mode was observed in x = 0.45 and not in the x = 0.4. We discuss the origin of crossover in the excitation spectrum between x = 0.45 and x = 0.4 with respect to discommensurations in the charge stripe structure.
ISSN:0374-4884
1976-8524
DOI:10.3938/jkps.62.1453