Mössbauer spectroscopy of the magnetic-field-induced ferroelectric phase of CuFeO2

Shin Nakamura, Yasuhiro Kobayashi, Shinji Kitao, Makoto Seto, Akio Fuwa, Noriki Terada

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    Abstract

    57 Fe Mössbauer spectroscopy in an applied magnetic field has been conducted on single crystals of CuFeO2 and CuFe 0.965Ga0.035O2 in order to investigate magnetic-field-induced ferroelectric states. The Mössbauer spectra observed under a magnetic field change significantly, corresponding to magnetic- field-induced phase transitions. In the ferroelectric incommensurate (FEIC) phase (7 < Hex < 13 T), the spectrum can be explained by a model with spins distributed at approximately 20, 95, and 160° from the c-axis in the (110) plane. This spin configuration resembles the "complex noncollinear spin configuration (CNC) " model proposed theoretically. In the FEIC phase, the isomer shift is larger, while the quadrupole splitting and average hyperfine field are smaller than those in the collinear four sublattice (4SL, 0 < Hex < 7 T) and five sublattice (5SL, H ex > 13 T) phases. In addition, a noticeable change in the hyperfine field is observed with varying magnetic fi eld. We consider that these changes indicate the change in the electronic state of the Fe3+ ion, possibly modified by a spin-orbit interaction.

    Original languageEnglish
    Article number024719
    JournalJournal of the Physical Society of Japan
    Volume84
    Issue number2
    DOIs
    Publication statusPublished - 2015 Feb 15

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    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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