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A -site dependent percolative thermopower and Griffiths phase in Pr <inf>(0.7-x)</inf>Ho <inf>x</inf>Sr <inf>0.3</inf>MnO <inf>3</inf> (x=0.0, 0.04, 0.08, and 0.1)
Date Issued
15-05-2005
Author(s)
Rama, N.
Opel, M.
Indian Institute of Technology, Madras
Gross, R.
Ogale, S. B.
Venkatesan, T.
Indian Institute of Technology, Madras
Abstract
We report our analysis of thermopower S (T) of Pr(0.7-x) Hox Sr0.3 Mn O3 (x=0, 0.04, 0.08, and 0.1) compounds within a percolative framework and correlate the results with the existence of a Griffiths phase. The Griffiths temperature, at which ferromagnetic metallic clusters nucleate above TC, is evaluated. We further show that the Griffiths phase extends over a higher temperature range above TC with increase in the variance of ionic radii of the A site. © 2005 American Institute of Physics.
Volume
97