A-site-disorder-dependent percolative transport and Griffiths phase in doped manganites

N. Rama, M. S. Ramachandra Rao, V. Sankaranarayanan, P. Majewski, S. Gepraegs, M. Opel, R. Gross

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63 Scopus citations

Abstract

The influence of A site disorder on the magnetic and transport properties of Pr0.6R0.1Sr0.3MnO3 (R = Tb, Y, Ho, and Er) polycrystalline samples is analyzed within the context of percolative transport and the existence of the Griffiths phase. The temperature dependence of the average spin moment at the hopping sites and the fraction of metallic clusters bear signatures of the onset of the Griffiths phase. Our analysis suggests that the paramagnetic phase comprises of insulating correlated spin clusters that coexist with ferromagnetic metallic clusters and paramagnetic spins. This coexistence was found to be sensitive to the A-site disorder.

Original languageEnglish
Article number224424
Pages (from-to)224424-1-224424-5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume70
Issue number22
DOIs
StatePublished - Dec 2004
Externally publishedYes

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