High-temperature magnetic anomalies in Sr-doped La manganite structures

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The temperature dependence of the magnetization M, susceptibility {chi}, and magnetoresistance MR for 3 perovskite-variant manganite structures were studied: monoclinic (x=0.075) and orthorhombic (x=0. 125) La{sub 1-x}Sr{sub x}MnO{sub 3}, and tetragonal layered La{sub 2- 2x}Sr{sub 1+2x}Mn{sub 2}O{sub 7} (x=0.4) with x also indicating the nominal fraction of Mn{sup 4+}. In each case, evidence is found for unusual magnetic states at temperatures T above their primary magnetic transitions. In the first case, the high-T {chi} deviates from Curie-Weiss expectations, in the second case the MR extends to high T, and in the last, M and {chi} exhibit short-range anomalies at high ... continued below

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16 p.

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Potter, C. D.; Swiatek, M.; Mitchell, J. F.; Hinks, D. G.; Jorgensen, J. D.; Bader, S. D. et al. November 1996.

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The temperature dependence of the magnetization M, susceptibility {chi}, and magnetoresistance MR for 3 perovskite-variant manganite structures were studied: monoclinic (x=0.075) and orthorhombic (x=0. 125) La{sub 1-x}Sr{sub x}MnO{sub 3}, and tetragonal layered La{sub 2- 2x}Sr{sub 1+2x}Mn{sub 2}O{sub 7} (x=0.4) with x also indicating the nominal fraction of Mn{sup 4+}. In each case, evidence is found for unusual magnetic states at temperatures T above their primary magnetic transitions. In the first case, the high-T {chi} deviates from Curie-Weiss expectations, in the second case the MR extends to high T, and in the last, M and {chi} exhibit short-range anomalies at high T. This suggests that a key feature of these systems is the existence of multiple magnetic energy scales, independent of structure, dimensionality, or doping levels.

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16 p.

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INIS; OSTI as DE97003887

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  • 41. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 12-15 Nov 1996

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  • Other: DE97003887
  • Report No.: ANL/MSD/CP--90207
  • Report No.: CONF-961141--10
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 465270
  • Archival Resource Key: ark:/67531/metadc678941

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  • November 1996

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  • July 25, 2015, 2:21 a.m.

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  • Dec. 11, 2015, 2:52 p.m.

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Potter, C. D.; Swiatek, M.; Mitchell, J. F.; Hinks, D. G.; Jorgensen, J. D.; Bader, S. D. et al. High-temperature magnetic anomalies in Sr-doped La manganite structures, article, November 1996; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc678941/: accessed May 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.