Inhomogeneous electronic state of low-doped insulating manganites: NMR and μSR evidence

Inhomogeneous electronic state of low-doped insulating manganites: NMR and μSR evidence

We report on an 55 Mn NMR investigation of calcium-doped manganite samples carried out at 4.2 K. In the insulating members of the family, the localization of hole-rich ferromagnetic clusters is revealed by the peculiar two-peaked spectra, and by distinct shifts of the resonance lines in an external...

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Veröffentlicht in:Journal of magnetism and magnetic materials 2002-04, Vol.242, p.635-639
Hauptverfasser: Allodi, G., Cestelli Guidi, M., De Renzi, R., Pieper, M.W.
Format: Artikel
Sprache:eng
Schlagworte:
Colossal magnetoresistance
Magnetic clusters
Muon spin rotation
NMR
Polarons
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Zusammenfassung:We report on an 55 Mn NMR investigation of calcium-doped manganite samples carried out at 4.2 K. In the insulating members of the family, the localization of hole-rich ferromagnetic clusters is revealed by the peculiar two-peaked spectra, and by distinct shifts of the resonance lines in an external field. Results are discussed in view of inelastic neutron scattering findings and combined 139 La NMR and μSR data.
ISSN:0304-8853
DOI:10.1016/S0304-8853(01)01031-9