Disorder and double-exchange spin dynamics in La0.7 Sr0.3 Mn O3 and La0.7 Sr0.3 Co O3 from NMR hyperfine couplings

M. J R Hoch, P. L. Kuhns, W. G. Moulton, A. P. Reyes, M. A. Torija, J. F. Mitchell, C. Leighton

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Abstract

The hole-doped transition metal oxides La1-x Srx Mn O3 (LSMO) and La1-x Srx Co O3 (LSCO) show certain similarities to each other in their physical properties but also marked differences. In the metallic-ferromagnetic doping range, important properties of these materials, such as nanoscale phase separation, are due to competing double-exchange ordering interactions and disordering Jahn-Teller (JT) distortions. The present experiments have used low magnetic field NMR of the Mn55 and Co59 transition metal ion nuclei in x=0.3 samples to obtain information on changes in hyperfine couplings and spin dynamics as a function of temperature. At low temperatures, anisotropy effects linked to lattice distortions are more important in LSCO than in LSMO. Structural distortions become important in LSMO above 120 K.

Original languageEnglish (US)
Article number104421
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume75
Issue number10
DOIs
StatePublished - Mar 26 2007

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