Evidence of ultra-slow polaron dynamics in low-doped manganites from 139La NMR-NQR and muon spin rotation

Abstract

We report a 139La NMR investigation of low-doped insulating manganite samples (LaMnO(3+y) and La(1-x)Ca(x)MnO(3+y)) as a function of temperature. A volume fraction with fast nuclear relaxations was revealed by the inhomogeneous loss of the NMR signal over a broad temperature interval. Comparison with muSR data demonstrates that the wipe out of the 139La signal is mainly due to slowly fluctuating electric field gradients. This provides strong evidence for the slow diffusion of lattice excitations, identified with Jahn-Teller small polarons.

4 pages, 4 figures. Latex 2.09, uses revtex 3.1 Submitted to Physical Review Letters

Cited by in corpus (10)

• Modelling colossal magnetoresistance manganites
• Orbital domain state and finite size scaling in ferromagnetic insulating manganites
• Percolative phase transition on ferromagnetic insulator manganites: uncorrelated to correlated polaron clusters
• Magnetic order, metamagnetic transitions, and low-temperature spin freezing in Ca3Co2O6: an NMR study
• Ferromagnetic insulating state in manganites:55Mn study
• Spin-orbital Jahn-Teller bipolarons
• Effective decoupling of ferromagnetic sublattices by frustration in Heusler alloys
• Emergent quasicrystals in strongly correlated systems
• Spin-polarized oxygen hole states in cation deficient La(1-x)CaxMnO(3+delta)
• Spin order and lattice frustration in optimally doped manganites. A high temperature NMR study.