NMR study of successive magnetic transitions in the A-site ordered perovskite LaMn3Cr4O12

Yu Kawasaki, Syota Takase, Yutaka Kishimoto, Takashi Ohno, Ikuya Yamada, Kentaro Shiro, Ryoji Takahashi, Kenya Ohgushi, Norimasa Nishiyama, Toru Inoue, Tetsuo Irifune

Research output: Contribution to journalArticlepeer-review

Abstract

We have investigated the successive magnetic phase transitions of the A-site ordered perovskite LaMn3Cr4O12 by measuring 139La nuclear magnetic resonance (NMR) spectra. The successive magnetic transitions are revealed by a very small but clear increase in the full width at half maximum (FWHM) of the 139La NMR signal at T M2 = 150 K and by the disappearance of the signal due to the line broadening at temperatures below T M1 = 50 K. These two magnetic transitions are associated with independent orderings within the Cr-site sublattice at T M2 and within the Mn-site sublattice at T M1. Regarding the magnetic structure of the Cr-site sublattice at temperatures below T M2, the cancellation of internal fields at the La site, ruling out ferromagnetic and multi-q antiferromagnetic structures, is consistent with the typical antiferromagnetic structure for perovskites, such as G-, A- and C-type orders. The uncanceled internal field at the La site at temperatures below T M1 is also consistent with these typical antiferromagnetic structures in the Mn-site sublattice. The differences in the temperature dependences of the Knight shift K(T) and the bulk susceptibility χ(T) are consistently explained by the independent magnetic orderings of the Cr- and the Mn-site sublattices and the cancellation of internal field originating from the Cr-site sublattice at the La site at temperatures below T M2.

Original languageEnglish
Pages (from-to)640-643
Number of pages4
JournalJournal of the Korean Physical Society
Volume63
Issue number3
DOIs
Publication statusPublished - 2013 Aug
Externally publishedYes

Keywords

  • Magnetic structure
  • Nuclear magnetic resonance
  • Perovskite antiferromagnet

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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