Charge Disproportionation and Antiferromagnetic Order of Sr3Fe2O7.

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  • Kuzushita Kaori
    Division of Materials Physics, Department of Physical Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560–8531
  • Morimoto Shotaro
    Division of Materials Physics, Department of Physical Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560–8531
  • Nasu Saburo
    Division of Materials Physics, Department of Physical Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560–8531
  • Nakamura Shin
    School of Science and Engineering, Teikyo University, Utsunomiya 320–8551

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  • Charge Disproportionation and Antiferromagnetic Order of Sr<sub><b> 3</b></sub>Fe<sub><b> 2</b></sub>O<sub><b> 7</b></sub>

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The charge disproportionation and the magnetic properties of Sr3Fe2O7, which has a double-layered perovskite structure, have been investigated. From 57Fe Mössbauer measurements, the Néel temperature TN and the critical temperature for the charge disproportionation reaction (2Fe4+→Fe3++Fe5+) are determined to be 120 K± 2 K and 343 K± 10 K, respectively. Above 343 K, spectra clearly show a Fe4+ singlet. The 57Fe Mössbauer spectrum at 4.5 K under externally applied longitudinal magnetic field consists of four magnetically split components and is similar to the spectrum obtained from CaFeO3 with a helical spin structure. With an increase of the external magnetic field, the relative intensity of the 2nd and 5th absorption peaks increases, which implies that the magnetic moments of Fe have a tendency to form a texture perpendicular to the direction of the external magnetic field.

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