Structural and magnetic phase diagram and room temperature CMR effect of La1−xAgxMnO3 |
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Authors: | L PiM Hervieu A MaignanC Martin B Raveau |
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Institution: | Laboratoire CRISMAT, UMR CNRS ISMRA 6508, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex 4, France |
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Abstract: | The study of the structural and magnetic phase diagram of the manganites La1−xAgxMnO3 shows similarity with the La1−x′Srx′MnO3 series, involving a metallic ferromagnetic domain at relatively high temperature (≈300 K). The Ag-system differs from the Sr-one by a much smaller homogeneity range (x≤1/6) and the absence of charge ordering. But the most important feature of the Ag-manganites deals with the exceptionally high magnetoresistance (−25%) at room temperature under 1.2 T, that appears for the composition x=1/6. The latter is interpreted as the coincidence of the optimal double exchange condition (Mn3+:Mn4+=2) with Tmax=300 K (maximum of the ρ(T) curve in zero field). |
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Keywords: | 72 80 Ga 75 30 Cr 75 30 Vn |
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