Two-dimensional ferromagnetic correlations above Tc in the Naturally layered CMR manganite La{sub 2-2x}Sr{sub 1+2x}Mn{sub 2}O{sub 7} (x = 0.3-0.4).

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Neutron diffuse scattering in the form of rod-like features are observed in single crystals of the layered CMR material La{sub 2{minus}2x}Sr{sub 1+2x}Mn{sub 2}O{sub 7} (x=0.4,0.36), consistent with the presence of 2D ferromagnetic spin correlations. These diffuse features are observed over a wide temperature region, however, their coherence length does not appear to diverge at T{sub c}, although there is evidence of the development of three-dimensional correlations around ferromagnetic reflections of the 3D-ordered magnetic structure close to T{sub c}. Quasi-elastic neutron scattering on a ceramic sample of x = 0.3 shows that the lifetime of these ferromagnetic correlations increases at T ... continued below

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22 p.

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Argyriou, D. N. March 23, 1998.

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Neutron diffuse scattering in the form of rod-like features are observed in single crystals of the layered CMR material La{sub 2{minus}2x}Sr{sub 1+2x}Mn{sub 2}O{sub 7} (x=0.4,0.36), consistent with the presence of 2D ferromagnetic spin correlations. These diffuse features are observed over a wide temperature region, however, their coherence length does not appear to diverge at T{sub c}, although there is evidence of the development of three-dimensional correlations around ferromagnetic reflections of the 3D-ordered magnetic structure close to T{sub c}. Quasi-elastic neutron scattering on a ceramic sample of x = 0.3 shows that the lifetime of these ferromagnetic correlations increases at T {r_arrow} T{sub c}. They exhibit a spin-diffusion constant above T{sub c} of {approximately}5 meV {angstrom}{sup 2}, much lower than that reported for La{sub 2/3}Ca{sub 1/3}MnO{sub 3}. We discuss the relationship of these magnetic correlations to models of the ferromagnetic transition in CMR compounds.

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22 p.

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OSTI as DE00010689

Medium: P; Size: 22 pages

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  • 43rd Annual Conference on Magnetism and Magnetic Materials, San Francisco, CA (US), 01/06/1998--01/09/1998

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  • Report No.: ANL/MSD/CP-95904
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 10689
  • Archival Resource Key: ark:/67531/metadc621992

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  • March 23, 1998

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  • June 16, 2015, 7:43 a.m.

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  • April 10, 2017, 3:17 p.m.

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Argyriou, D. N. Two-dimensional ferromagnetic correlations above Tc in the Naturally layered CMR manganite La{sub 2-2x}Sr{sub 1+2x}Mn{sub 2}O{sub 7} (x = 0.3-0.4)., article, March 23, 1998; Illinois. (digital.library.unt.edu/ark:/67531/metadc621992/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.