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Title: Charge-order melting in charge-disproportionated perovskite CeCu3Fe4O12
Authors: Yamada, I
Etani, H
Hayashi, N
Mizumaki, M
Ueda, S
Abe, H
Liss, KD
Studer, AJ
Ozaki, T
Mori, S
Takahashi, R
Irifune, T
Issue Date: 21-Oct-2014
Publisher: PubMed
Citation: Yamada, I., Etani, H., Murakami, M., Hayashi, N., Kawakami, T., Mizumaki, M., . . . Irifune, T. (2014). Charge-Order Melting in Charge-Disproportionated Perovskite CeCu3Fe4O12. Inorganic Chemistry, 53(21), 11794-11801. doi:
Abstract: A novel quadruple perovskite oxide CeCu3Fe4O12 has been synthesized under high-pressure and high-temperature conditions of 15 GPa and 1473 K. (57)Fe Mössbauer spectroscopy displays a charge disproportionation transition of 4Fe(3.5+) → 3Fe(3+) + Fe(5+) below ∼270 K, whereas hard X-ray photoemission and soft X-ray absorption spectroscopy measurements confirm that the Ce and Cu valences are retained at approximately +4 and +2, respectively, over the entire temperature range measured. Electron and X-ray diffraction studies reveal that the body-centered cubic symmetry (space group Im3̅, No. 204) is retained at temperatures as low as 100 K, indicating the absence of any types of charge-ordering in the charge-disproportionated CeCu3Fe4O12 phase. The magnetic susceptibility and neutron powder diffraction data illustrate that the antiferromagnetic ordering of Fe ions is predominant in the charge-disproportionated CeCu3Fe4O12 phase. These findings suggest that CeCu3Fe4O12 undergoes a new type of electronic phase in the ACu3Fe4O12 series and that the melting of the charge-ordering in CeCu3Fe4O12 is caused by the substantial decrease in the Fe valence and the resulting large deviation from the ideal abundance ratio of Fe(3+):Fe(5+) = 1:1 for rock-salt-type charge-ordering. © 2014, American Chemical Society.
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