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      Magnetic Field Melting of the Charge-Ordered State of La0.5Ca0.5MnO3: A Local Structure Perspective

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          Abstract

          The local structure about the Mn site in the half doped system La0.5Ca0.5MnO3 was measured in magnetic fields up 10 T to probe the melting of the charge ordered state. Examination of the Mn-O and Mn-Mn correlations reveal three distinct regions in the structure-field diagram. A broad region with weak field dependence (mainly antiferromatnetic phase below 7.5 T), a narrow-mixed phase region near ~ 8.5 T followed by a ferromagnetic phase region with strong field-structure coupling. At high field the Mn-O radial distribution becomes Gaussian and the Mn-Mn correlations are enhanced - consistent with the dominance of a ferromagnetic phase. The exponential change in resistivity in the first region (observed in transport measurements) is dominated by the reordering of the moments on the Mn sites from CE type antiferromagnetic to ferromagnetic order with only a weak change in the local distortions of the MnO6 octahedra.

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          Most cited references55

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          Low Temperature Magnetoresistance and the Magnetic Phase Diagram ofLa1−xCaxMnO3

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            Mixed-valence manganites

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              The physics of manganites: Structure and transport

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                Author and article information

                Journal
                09 June 2003
                Article
                10.1103/PhysRevB.70.024410
                cond-mat/0306229
                964bbc0f-ec7e-45bc-957a-6696726bbd06
                History
                Custom metadata
                cond-mat.str-el cond-mat.mes-hall

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