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

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4 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number073044
JournalNew Journal of Physics
Volume16
DOIs
Publication statusPublished - 2014 Jul
Externally publishedYes

Keywords

  • hard x-ray photoemission spectroscopy
  • resonant soft x-ray diffraction

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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