title: Direct observation of the bandwidth-disorder induced variation of charge/orbital ordering structure in RE(0.5)(Ca(1-y)Sr(y))(1.5)MnO(4).
abstract: Changes in the charge/orbital ordering (CO/OO) structure with the bandwidth of the e(g) band and quenched disorder were investigated in doped manganites RE(0.5)(Ca(1-y)Sr(y))(1.5)MnO(4)(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 (T(CO/OO)) decreases. Changes in structure and T(CO/OO) with different A-site combinations reveal that the CO/OO phase is strongly suppressed by the widening of the e(g) band and the stronger quenched disorder in these layered manganites.
authors.affiliation: Spin Super Structure Project, Exploratory Research for Advanced Technology (ERATO), Japan Science and Technology Agency, Tsukuba 305-8562, Japan. Advanced Electron Microscopy Group, National Institute for Materials Science, Tsukuba, 305-0044, Japan.
authors.forename: X Z
authors.initials: XZ
authors.lastname: Yu
authors.forename: T
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authors.lastname: Arima
authors.forename: Y
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authors.lastname: Kaneko
authors.forename: J P
authors.initials: JP
authors.lastname: He
authors.forename: R
authors.initials: R
authors.lastname: Mathieu
authors.forename: T
authors.initials: T
authors.lastname: Asaka
authors.forename: T
authors.initials: T
authors.lastname: Hara
authors.forename: K
authors.initials: K
authors.lastname: Kimoto
authors.forename: Y
authors.initials: Y
authors.lastname: Matsui
authors.forename: Y
authors.initials: Y
authors.lastname: Tokura