Evolution of magnetic and structural transitions and enhancement of magnetocaloric effect in Fe1-xMnx V2 O4

D. Choudhury, T. Suzuki, D. Okuyama, D. Morikawa, K. Kato, M. Takata, K. Kobayashi, R. Kumai, H. Nakao, Y. Murakami, M. Bremholm, B. B. Iversen, T. Arima, Y. Tokura, Y. Taguchi

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23 Citations (Scopus)

Abstract

Magnetic, structural, and magnetocaloric properties have been investigated for a solid-solution system, Fe1-xMnxV2O4 (0.0≤x≤1.0) with a spinel structure. As orbital-active Fe2+ ions are partially substituted with orbital-inactive Mn2+ ions, various interactions, such as the Jahn-Teller interaction, spin-orbit coupling, and the exchange interaction, compete with each other, giving rise to a rich magnetic and structural phase diagram. The magnetocaloric effect exhibits two peaks as a function of temperature for x≤0.9, associated with a higher-temperature ferrimagnetic transition, and with a lower-temperature concomitant spin-canting and orbital-ordering (mostly lattice-structural) transition of the V site. The large magnetocaloric effect as observed in MnV2O4 can thus be attributed to the sum of the entropy changes upon the merged phase transition at TN1∼TN2.

Original languageEnglish
Article number104427
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number10
DOIs
Publication statusPublished - 2014 Mar 31

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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