Layered CMR manganites: Structure, properties, and unconventional magnetism

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Neutron powder diffraction studies of the layered compounds R{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7}, (R = La, Pr, Nd), RSr{sub 2}Mn{sub 2}O{sub 7} (R = Pr, Nd), and La{sub 1.4}Sr{sub 1.6}Mn{sub 2}O{sub 7} show that the degree of distortion of the MnO{sub 6} octahedra do not correlate with the appearance of a metal-insulator (MI) transition in these compounds. Instead, the in-plane Mn-O bond length appears to be a better indicator of the electronic behavior. Detailed bulk magnetization studies on single crystal La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7} show that there are three magnetic regimes as a function of temperature: paramagnetic insulator, short-range ... continued below

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8 p.

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Mitchell, J. F.; Argyriou, D. N.; Potter, C. D.; Jorgensen, J. D.; Hinks, D. G. & Bader, S. D. 1997.

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Neutron powder diffraction studies of the layered compounds R{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7}, (R = La, Pr, Nd), RSr{sub 2}Mn{sub 2}O{sub 7} (R = Pr, Nd), and La{sub 1.4}Sr{sub 1.6}Mn{sub 2}O{sub 7} show that the degree of distortion of the MnO{sub 6} octahedra do not correlate with the appearance of a metal-insulator (MI) transition in these compounds. Instead, the in-plane Mn-O bond length appears to be a better indicator of the electronic behavior. Detailed bulk magnetization studies on single crystal La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7} show that there are three magnetic regimes as a function of temperature: paramagnetic insulator, short-range ordered (SRO) ferromagnet, and long-range ordered (LRO) ferromagnet. Scaling analysis indicates that a 2D finite-size XY model is an appropriate description of the magnetic state in the SRO regime.

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8 p.

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INIS; OSTI as DE97008662

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  • 1996 Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 2-6 Dec 1996

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  • Other: DE97008662
  • Report No.: ANL/MSD/CP--92903
  • Report No.: CONF-961202--
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 554741
  • Archival Resource Key: ark:/67531/metadc694264

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  • 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Dec. 15, 2015, 11:57 a.m.

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Mitchell, J. F.; Argyriou, D. N.; Potter, C. D.; Jorgensen, J. D.; Hinks, D. G. & Bader, S. D. Layered CMR manganites: Structure, properties, and unconventional magnetism, article, 1997; Illinois. (digital.library.unt.edu/ark:/67531/metadc694264/: accessed August 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.