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dc.contributor.authorJoshi, Janhavi P-
dc.contributor.authorGupta, Rajeev-
dc.contributor.authorSood, A K-
dc.contributor.authorBhat, S V-
dc.contributor.authorRaju, A R-
dc.contributor.authorRao, C N R-
dc.identifier.citationPhysical Review B 65(2), 024410-(1-8) (2001)en_US
dc.description.abstractWe report electron paramagnetic resonance measurements on single crystalline and powder samples of Nd0.5Ca0.5MnO3 across the charge-ordering transition at Tco=240 K down to the antiferromagnetic ordering transition at TN=140 K. The changes in the linewidth, g-factor and intensity as functions of temperature are studied to understand the nature of spin-dynamics in the system. We explain the observed large decrease in the linewidth from TN to Tco in terms of motional narrowing caused by the hopping of the Jahn-Teller polarons yielding an activation energy of Ea=0.1 eV. Similar analysis of data on Pr0.6Ca0.4MnO3 published earlier gives Ea=0.2 eV. Below Tco, the g-value increases continuously suggesting a gradual strengthening of the orbital ordering. We give a qualitative explanation of the maximum in the asymmetry ratio A/B observed at Tco and its temperature dependence in single crystal spectra which also supports the model of motional narrowing.en_US
dc.publisherThe American Physical Societyen_US
dc.rights© 2001 The American Physical Societyen_US
dc.subjectElectron paramagnetic resonance and relaxationen_US
dc.subjectTransition-metal compoundsen_US
dc.subjectMetal-insulator transitions and other electronic transitionsen_US
dc.titleTemperature-dependent electron paramagnetic resonance studies of charge-ordered Nd0.5Ca0.5MnO3en_US
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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