Mn K-edge X-ray absorption spectroscopy (XAS) studies of La{sub 1{minus}x}Sr{sub x}MnO{sub 3}

Book · Thu Dec 31 04:00:00 EST 1998

OSTI ID:323396

Mini, S M; Kimball, C W ^[1]; Mitchell, J F; Hinks, D G; Rosenmann, D ^[2]; Alatas, A ^[3]; Montano, P A ^[4]

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1. Northern Illinois Univ., DeKalb, IL (United States). Dept. of Physics
2. Argonne National Lab., IL (United States). Materials Science Div.
3. Illinois Inst. of Tech., Chicago, IL (United States)
4. Univ. of Illinois, Chicago, IL (United States). Dept. of Physics

Systematic Mn K-edge x-ray absorption spectroscopy (XAS) measurements on samples of La{sub 1{minus}x}Sr{sub x}MnO{sub 3}, which are precursors to colossal magnetoresistive (CMR) materials, are reported. Detailed results on the edge or chemical shift as a function of Sr concentration (hole doping) and sample preparation (air vs. oxygen annealed), are discussed. For comparison, a systematic XANES study of the Mn K-edge energy shift, denoting valence change in Mn, has been made in standard manganese oxide systems. Contrary to expectations, the variation in near-edge energies for Mn in La{sub 0.725}Sr{sub 0.275}MnO{sub 3} were small when compared to the difference between that for manganese oxide standards of nominal valence of +3 and +4 (Mn{sub 2}O{sub 3} and MnO{sub 2}).

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• Sponsoring Organization: Office of Naval Research, Washington, DC (United States); USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 323396
• Report Number(s): CONF-971201--; ISBN 1-55899-399-1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
CRYSTAL STRUCTURE
ENERGY LEVELS
EXPERIMENTAL DATA
LANTHANUM OXIDES
MANGANESE OXIDES
STOICHIOMETRY
STRONTIUM OXIDES
SYNTHESIS
VALENCE