NMR IN MANGANESE PEROVSKITES - DETECTION OF SPATIALLY VARYING ELECTRON-STATES IN DOMAIN-WALLS

Authors
PAPAVASSILIOU G FARDIS M MILIA F PISSAS M KALLIAS G NIARCHOS D DIMITROPOULOS C SCHERRER P
Citation
G. Papavassiliou et al., NMR IN MANGANESE PEROVSKITES - DETECTION OF SPATIALLY VARYING ELECTRON-STATES IN DOMAIN-WALLS, Physical review. B, Condensed matter, 58(18), 1998, pp. 12237-12241
Citations number
26
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physical review. B, Condensed matter → ACNP
ISSN journal
01631829
Volume
58
Issue
18
Year of publication
1998
Pages
12237 - 12241
Database
ISI
SICI code
0163-1829(1998)58:18<12237:NIMP-D>2.0.ZU;2-Z
Abstract
Mn-55 and La-139 NMR line shape and spin-spin relaxation time T-2 meas urements on polycrystalline La0.67Ca0.33MnO3 were carried out as a fun ction of temperature. For T < 80 K the Mn-55 NMR line shapes have been attributed to spatial encoding of the NMR frequency due to variation of the charge-carrier (hole) density across domain walls. For T > 80 K walls are effectively transparent to hole motion and by using 55Mn an d La-139 1/T-2 measurements hole scattering is shown to be governed so lely by spin-wave excitations. [S0163-1829(98)00241-0].