Abstract
We report electron spin resonance measurements in single crystallineNd0.7Sr0.3MnO3 that provide evidence for the existence of spin–lattice correlated clusters above and belowTC (= 205 K). The linewidth of the paramagnetic spectrum indicates the presence ofstrong electron–phonon interaction rather than the spin only interactionseen in other manganites. The gradual increase observed in theg valueabove TC is attributed to the presence of orbital correlations. The observationof ferromagnetic resonance (FMR) spectra only below 185 K(TC = 205 K) and noisy features in the FMR spectra above 140 K are ascribed to the strongcompetition between localization due to lattice distortions and delocalization of chargecarriers. The magnetocrystalline anisotropy of the sample splits the FMR line into twobelow 185 K. An additional splitting observed in the FMR line is attributed to the existenceof spin–lattice correlated (insulating) clusters within the ferromagnetic (metallic)phase. The influence of these clusters on the spin dynamics above and belowTC is discussed.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
