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

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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 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.

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Correspondence to Yu Kawasaki.

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Kawasaki, Y., Takase, S., Kishimoto, Y. et al. NMR study of successive magnetic transitions in the A-site ordered perovskite LaMn3Cr4O12 . Journal of the Korean Physical Society 63, 640–643 (2013). https://doi.org/10.3938/jkps.63.640

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  • DOI: https://doi.org/10.3938/jkps.63.640

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