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Electron spin resonance study of Nd <inf>0.7</inf>Sr <inf>0.3</inf>MnO <inf>3</inf> single crystals
Date Issued
15-05-2005
Author(s)
Angappane, S.
Indian Institute of Technology, Madras
Rangarajan, G.
Indian Institute of Technology, Madras
Abstract
Electron spin resonance (ESR) measurements in Nd0.7 Sr0.3 Mn O3 single crystals provide evidence for the existence of spin and lattice correlated clusters above and below TC =205 K. 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 180 K (TC =205 K) and more noise in the spectra between 150 and 180 K are ascribed to the strong competition between localization due to lattice distortions and delocalization of charge carriers. © 2005 American Institute of Physics.
Volume
97