Disorder and double-exchange spin dynamics in La0.7Sr0.3MnO3 and La0.7Sr0.3CoO3 from NMR hyperfine couplings

Hoch  MJR; Kuhns  PL; Moulton  WGReyes  APTorija  MAMitchell  JFLeighton  C

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Disorder and double-exchange spin dynamics in La0.7Sr0.3MnO3 and La0.7Sr0.3CoO3 from NMR hyperfine couplings

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The hole-doped transition metal oxides La1-xSrxMnO3 (LSMO) and La1-xSrxCoO3 (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 Mn-55 and Co-59 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.

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《Physical review, B. Condensed matter and materials physics》 |2007年第10期|4421-1-4421-9-0|共9页
作者
Hoch MJR; Kuhns PL; Moulton WGReyes APTorija MAMitchell JFLeighton C;
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作者单位

Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA;

Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA;

Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA;

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正文语种英语
中图分类固体物理学;
关键词
NUCLEAR MAGNETIC RELAXATION; TRANSITION METALS; MANGANITES; LA1-XSRXMNO3; LACOO3; MAGNETORESISTANCE; POLARIZATION; DISTORTIONS; TRANSPORT; CRYSTALS;

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Disorder and double-exchange spin dynamics in La0.7Sr0.3MnO3 and La0.7Sr0.3CoO3 from NMR hyperfine couplings

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