Orbital and Charge Ordering in La_<1-x>Sr_<1+x>MnO_4 (0.4≤x≤0.5) : Condensed Matter: Electronic Properties, etc.

概要

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Hole concentration dependence of charge order (CO) and orbital order (OO) in layered perovskite compounds La_<1-x>Sr_<1+x>MnO_4 has been studied by means of the resonant X-ray scattering technique. Both CO and OO are observed below 210 K in the compounds having the hole concentration x between 0.5 and 0.48, but neither is observed for x ⪇ 0.46. The transition temperatures are nearly independent of x between 0.5 and 0.48. Correlation lengths ξ's for both orders obtained from analyses of superlattice peak profiles are finite at any temperature. Moreover, in contrast to the cubic perovskite, ξ for OO is larger than that for CO. ξ for OO is as short as that for CO at the critical concentration of x = 0.48. These results suggest that OO is prerequisite to the forming of CO in this system.
社団法人日本物理学会の論文
2001-05-15