Interplay between the crystalline and magnetic structures in lightly Cr-doped Bl0.37Ca0.63Mn0.96Cr 0.04O2.99

Chun Chuen Yang, Wen Hsien Li, Chun Ming Wu, Carissa H.C. Li, Jirong Sun, Jeffrey W. Lynn

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Abstract

The interplay between the crystalline and magnetic structures of a 4% Cr-doped Bi0.37Ca0.63Mn0.96Cr 0.04O2.99 has been Investigated by alternating current (ac) magnetic susceptibility, electrical resistivity, and neutron diffraction measurements. The compound crystallizes into a monocllnic P21/m symmetry. A Jahn-Teller distortion occurs at 280 K. The thermal behavior of charge transport may be described by a three-dimensional variable range hopping conduction. Strong interplay between the localized magnetic electrons and the itinerant electrons are clearly revealed as the localization length increases by 20% when the Mn spins become ordered below 85 K. Short range magnetic correlations persist up to 160 K. The collinear magnetic structure can be viewed as consisting of ferromagnetic spintrlmers antiferromagnetically embedded In a ferromagnetic environment. Cr-doplng reduces the charge ordering temperature and the magnetic ordering temperature. It nevertheless introduces long-range ferromagnetism.

Original languageEnglish
Pages (from-to)3297-3304
Number of pages8
JournalInorganic Chemistry
Volume49
Issue number7
DOIs
StatePublished - 5 Apr 2010

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