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

Freeman, P. G., Giblin, Sean, Hradil, K., Mole, R. A. and Prabhakaran, D. 2013. Development of the magnetic excitations of charge-stripe ordered La2-xSrxNiO4 on doping towards checkerboard charge order. Journal of Korean Physical Society 62 (10) , pp. 1453-1457. 10.3938/jkps.62.1453

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Abstract

The magnetic excitation spectrums of charge stripe ordered La2−x Sr x NiO4 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 Ni2+ S = 1 spins to match that of checkerboard charge ordered La1.5Sr0.5NiO4. 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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Uncontrolled Keywords: Stripe-ordered; La2−xSrxNiO4; Excitations
Publisher: Korean Physical Society
ISSN: 0374-4884
Last Modified: 04 Jun 2017 05:50
URI: http://orca.cf.ac.uk/id/eprint/53977

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