Emission Mössbauer studies of the magnetoresistive compound, La0.7Sr0.3MnO3

Amar Nath, Vladimir Chechersky, K. V. Ramanujachary, Robert Butterick, Sam Lofland, Steve Preite

Research output: Contribution to journalArticlepeer-review

Abstract

The magnetic behavior of the Sr0.3 manganite is studied using a local microprobe, 57Co. In contrast with Ca substituted manganites, a much larger fraction of the material exhibits short-range order with superparamagnetic-like behavior even at 80 K. The differences in behavior are attributed to the large mismatch between the ionic radii of La+3 and the divalent substituent Sr+2, which introduces anharmonicity in local vibrations. In common with all other compounds exhibiting negative bulk magnetoresistivity, the Sr0.3 compound also exhibits very marked softening of lattice as one approaches Tc from below. Application of an external magnetic field results in coalescing of nanosized magnetic clusters to form larger ones with better alignment of spins.

Original languageEnglish (US)
Pages (from-to)224-228
Number of pages5
JournalSolid State Communications
Volume138
Issue number5
DOIs
StatePublished - May 2006

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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