Short range spin correlations in the CMR material La{sub 1.41}Sr{sub 1.6}Mn{sub 2}O{sub 7}

Technical Report · Mon Dec 01 04:00:00 EST 1997

DOI:https://doi.org/10.2172/555577· OSTI ID:555577

Kelley, T M; Argyriou, D N; Robinson, R A; Nakotte, H ^[1]; Mitchell, J F; Osborn, R; Jorgensen, J D ^[2]

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1. Los Alamos National Lab., NM (United States). Manuel Lujan Jr. Neutron Scattering Center
2. Argonne National Lab., IL (United States). Materials Science Div.

The (La{sub 1{minus}x}Sr{sub x}){sub 2}Mn{sub 3}O{sub 7} compounds are layered materials that exhibit higher magneto-resistance than the corresponding 3D manganite perovskites. Quasi-elastic neutron scattering on a polycrystalline sample of La{sub 1.4}Sr{sub 1.6}Mn{sub 2}O{sub 7} shows that the spin fluctuation spectrum of these layered CMR materials is qualitatively similar to those found in the perovskite manganites (La,Ca)MnO{sub 3}; their concentration, lifetime, and coherence length increase as T decreases to {Tc}. Unlike the perovskites the authors found a lower spin-diffusion constant above {Tc} of {approximately} 5 meV {angstrom}{sup 2}.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 555577
• Report Number(s): LA-UR--97-3667; CONF-970814--; ON: DE98001473
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CURIE POINT
EXPERIMENTAL DATA
LANTHANUM OXIDES
MAGNETORESISTANCE
MANGANESE OXIDES
POLARONS
STRONTIUM OXIDES