Orbital correlations and dimensional crossover in epitaxial Pr 0.5Ca0.5MnO3/La0.5Sr 0.5MnO3 superlattices

H. Wadati, J. Okamoto, M. Garganourakis, V. Scagnoli, U. Staub, E. Sakai, H. Kumigashira, T. Sugiyama, E. Ikenaga, M. Nakamura, M. Kawasaki, Y. Tokura

研究成果: ジャーナルへの寄稿学術誌査読

5 被引用数 (Scopus)

抄録

We studied the charge-orbital ordering in the superlattice of charge-ordered insulating Pr0.5Ca0.5MnO3 and ferromagnetic metallic La0.5Sr0.5MnO3 by resonant soft x-ray diffraction (RSXD) and hard x-ray photoemission spectroscopy (HXPES). A temperature-dependent incommensurability is found in the orbital ordering by RSXD. In addition, a large hysteresis is observed that is caused by phase competition between the insulating charge ordered and metallic ferromagnetic states. No magnetic phase transitions are observed in contrast to pure Pr0.5Ca0.5MnO3 thin films, confirming the unique character of the superlattice. Mn HXPES spectra revealed a hysteresis in the metalicity, supporting the picture of phase competition. The deviation from the commensurate orbital order can be directly related to the decrease of ordered-layer thickness that leads to dimensional crossover from three-dimensional to two-dimensional orbital ordering.

本文言語英語
論文番号073044
ジャーナルNew Journal of Physics
16
DOI
出版ステータス出版済み - 7月 2014
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 物理学および天文学一般

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