Abstract
Electron spin resonance (ESR) measurements in Nd0.7Sr0.3MnO3 single crystals provide evidence for the existence of spin and lattice correlated clusters above and below TC=205K. The ESR linewidth deviates from the quasilinear “universal” temperature dependence of the linewidth observed in several manganites. A linear temperature dependence of the linewidth is attributed to the spin-phonon interaction. Thus the linewidth of the paramagnetic resonance line indicates the presence of a strong spin-phonon interaction rather than the spin-spin interaction seen in other manganites. The gradual increase observed in the g value above TC is attributed to the presence of orbital correlations. The split in the ESR spectra only below 180K (TC=205K) and more noise in the spectra between 150 and 180K are ascribed to the strong competition between localization due to lattice distortions and delocalization of charge carriers.
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