Mössbauer study of the ferroelectric state in Ga-substituted CuFeO2

Shin Nakamura, Akio Fuwa, Noriki Terada

    Research output: Contribution to journalArticle

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    Abstract

    57Fe Mössbauer spectroscopic measurements have been conducted on CuFe1-xGaxO2 single crystals, in order to investigate the magnetic structures and hyperfine parameters in ferroelectric CuFe0.965Ga0.035O2 and paraelectric CuFeO2. We confirmed that the Mössbauer spectrum at 4.2K in CuFeO2 is explained by the collinear antiferromagnetic structure with spins along the hexagonal c-axis. In the ferroelectric phase in CuFe0.965Ga0.035O2, the spectrum consists of three magnetic components, where magnetic hyperfine fields distribute in three different directions within the (110) plane. This configuration is not completely consistent with a simple proper screw structure with a uniform spin distribution. The quadrupole coupling constants e2qQ/2 are unexpectedly large for both specimens. In the ferroelectric state in CuFe 0.965Ga0.035O2, e2qQ/2 becomes noticeably smaller than that in the paraelectric phase in CuFeO2. We discuss the difference in quadrupole coupling constant between the ferroelectric and paraelectric states in CuFe1-xGaxO2.

    Original languageEnglish
    Article number044701
    JournalJournal of the Physical Society of Japan
    Volume83
    Issue number4
    DOIs
    Publication statusPublished - 2014 Apr 15

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    Mössbauer study of the ferroelectric state in Ga-substituted CuFeO2 . / Nakamura, Shin; Fuwa, Akio; Terada, Noriki.

    In: Journal of the Physical Society of Japan, Vol. 83, No. 4, 044701, 15.04.2014.

    Research output: Contribution to journalArticle

    Nakamura, Shin ; Fuwa, Akio ; Terada, Noriki. / Mössbauer study of the ferroelectric state in Ga-substituted CuFeO2 In: Journal of the Physical Society of Japan. 2014 ; Vol. 83, No. 4.
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