Nanostructural evidence at the phase boundary of A-and C-type antiferromagnetic phases in Nd1-xSrxMnO3 crystals

M. Nagao, T. Asaka, D. Akahoshi, R. Hatakeyama, T. Nagai, M. Saito, K. Watanabe, M. Tanaka, A. Yamazaki, T. Hara, K. Kimoto, H. Kuwahara, Y. Matsui

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Abstract

A weak ferromagnetic phase appears around the phase boundary between the A-type and C-type antiferromagnetic phases in overdoped Nd1-xSr xMnO3 crystals (0.6≤x≤0.7). We investigated the crystal structure and the magnetic domain structure around the phase boundary, by powder synchrotron x-ray diffractometry and transmission electron microscopy. The phase boundary exists between x = 0.62 in the phase separation region where the A-type and C-type antiferromagnetic phases coexist and x = 0.625 in the C-type antiferromagnetic phase. By transmission electron microscopy, the orbital-disordered nanodomains in the C-type antiferromagnetic matrix phase were only observed in the vicinity of the phase boundary in the C-type antiferromagnetic phase. This is a nanoscale inhomogeneity but is not a conventional phase separation for manganites. We also successfully observed magnetic domain structures in the weak ferromagnetic phase by Lorentz electron microscopy. Moreover, we found that the ferromagnetic correlation becomes a short-range correlation when the orbital-disordered nanodomains appear. We consider that the orbital-disordered nanodomains interfere with the long-range ferromagnetic correlation.

Original languageEnglish
Article number492201
JournalJournal of Physics Condensed Matter
Volume19
Issue number49
DOIs
Publication statusPublished - 2007 Dec 12

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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    Nagao, M., Asaka, T., Akahoshi, D., Hatakeyama, R., Nagai, T., Saito, M., Watanabe, K., Tanaka, M., Yamazaki, A., Hara, T., Kimoto, K., Kuwahara, H., & Matsui, Y. (2007). Nanostructural evidence at the phase boundary of A-and C-type antiferromagnetic phases in Nd1-xSrxMnO3 crystals. Journal of Physics Condensed Matter, 19(49), [492201]. https://doi.org/10.1088/0953-8984/19/49/492201