Journal of the Korean Physical Society

, Volume 63, Issue 3, pp 640–643

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
Article
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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 TM2 = 150 K and by the disappearance of the signal due to the line broadening at temperatures below TM1 = 50 K. These two magnetic transitions are associated with independent orderings within the Cr-site sublattice at TM2 and within the Mn-site sublattice at TM1. Regarding the magnetic structure of the Cr-site sublattice at temperatures below TM2, 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 TM1 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 TM2.

Keywords

Perovskite antiferromagnet Magnetic structure Nuclear magnetic resonance 

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Copyright information

© The Korean Physical Society 2013

Authors and Affiliations

  • Yu Kawasaki
    • 1
  • Syota Takase
    • 1
  • Yutaka Kishimoto
    • 1
  • Takashi Ohno
    • 1
  • Ikuya Yamada
    • 2
  • Kentaro Shiro
    • 3
  • Ryoji Takahashi
    • 3
  • Kenya Ohgushi
    • 4
  • Norimasa Nishiyama
    • 5
  • Toru Inoue
    • 6
  • Tetsuo Irifune
    • 6
  1. 1.Department of Quantum Materials Science, Institute of Technology and ScienceThe University of TokushimaTokushimaJapan
  2. 2.Nanoscience and Nanotechnology Research CenterOsaka Prefecture UniversitySakaiJapan
  3. 3.Department of Chemistry, Graduate School of Science and EngineeringEhime UniversityMatsuyamaJapan
  4. 4.Institute for Solid State PhysicsUniversity of TokyoKashiwaJapan
  5. 5.Photon ScienceDeutsches Elektronen Synchrotron DESYHamburgGermany
  6. 6.Geodynamics Research CenterEhime UniversityMatsuyamaJapan
  7. 7.Nichia CorporationTokushimaJapan

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