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IOP Publishing, Journal of Physics: Condensed Matter, 17(19), p. 172203, 2007

DOI: 10.1088/0953-8984/19/17/172203

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Direct observation of the bandwidth-disorder induced variation of charge/orbital ordering structure in RE0.5(Ca1−ySry)1.5MnO4

Journal article published in 2007 by X. Z. Yu, T. Arima, Y. Kaneko, J. P. He, R. Mathieu ORCID, T. Asaka, T. Hara, K. Kimoto, Y. Matsui, Y. Tokura
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This paper is available in a repository.

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Abstract

Changes in the charge/orbital ordering (CO/OO) structure with the bandwidth of the eg band and quenched disorder were investigated in doped manganites RE0.5(Ca1-ySry)1.5MnO4(RE = Pr,Eu) with a single-layer perovskite structure. A systematic study of the modulation structure associated with the CO/OO phase demonstrated that the long-range commensurate structure changes to a short-range incommensurate structure with increasing Sr content through the enhancement of the bandwidth and quenched disorder in these systems. At the same time, the transition temperature of CO/OO (TCO/OO) decreases. Changes in structure and TCO/OO with different A-site combinations reveal that the CO/OO phase is strongly suppressed by the widening of the eg band and the stronger quenched disorder in these layered manganites.