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Magnetic Anomaly of La1-xMxFeO3 (M = Ca, Sr, and Ba) around 100K

Author:
Nakamae, Yuki  Ishida, Shu  Takemura, Wataru  Ohno, Masatoshi  Okada, Akimasa  Mitsui, Toshihiro  Kobayashi, Yoshihiko  Nakamura, Jin  Asai, Kichizo  


Journal:
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN


Issue Date:
2014


Abstract(summary):

A magnetic anomaly has been found around 100K in La1-xMxFeO3 (M = Ca, Sr, and Ba) and Pr1-xSrxFeO3 with 0.05 <= x <= 0.4; the spontaneous magnetization of the weak ferromagnet increases below about 100K after cooling in a magnetic field. We propose a model in which Fe4+ ions populated by doped holes preferentially occupy one magnetic sublattice of the antiferromagnetic structure in LaFeO3 and PrFeO3 as a result of charge ordering, which induces an inequality between the sublattice magnetizations and modifies the system from the antiferromagnet to a ferrimagnet. The magnetization below the magnetic anomaly temperature is explained as that of a weak ferromagnet with the canted sublattice magnetizations of the ferrimagnet.


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