Perturbed-angular-correlation studies in hafnium doped La0.67Ca0.33MnO3

Govindaraj, R. ; Sundar, C. S. ; Seetha Lakshmi, L. ; Sridharan, V. ; Premila, M. ; Natarajan, D. V. (2004) Perturbed-angular-correlation studies in hafnium doped La0.67Ca0.33MnO3 Chemical Physics, 302 (1-3). pp. 185-192. ISSN 0301-0104

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181Ta perturbed-angular-correlation (PAC) spectroscopic measurements have been carried out in 0.5 at.% Hf doped La0.67Ca0.33MnO3 samples to understand the electronic and local structural property at the site(s) of substitution of the probe nuclei. Predominantly two fractions are observed which is understood to be due to occupancy of probe atoms at two distinct Mn sites. Based on systematic PAC studies of the sample subjected to vacuum quenching/oxygen annealing treatments it is inferred that these sites are due to the probe atoms occupying Mn4+ and Mn3+ rich sites, bringing out the occurrence of electronically segregated/chemically inhomogeneous phases. These phases are characterized in terms of electric field gradients at Mn sites. quadrupole parameters experienced by the probe atoms occupying Mn3+ rich sites are observed to be quite sensitive to vacuum quenching/oxygen annealing treatments. Significantly different quadrupole parameters in the present system as compared to undoped LaMnO3 is understood mainly based on the difference in the electronic properties of the systems.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Manganite; Perturbed Angular Correlation
ID Code:53254
Deposited On:05 Aug 2011 10:37
Last Modified:05 Aug 2011 10:37

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