Critical properties of the double-exchange ferromagnet Nd(0.6)Pb(0.4)MnO(3)

Sahana, M and Rossler, UK and Ghosh, Nilotpal and Elizabeth, Suja and Bhat, HL and Dorr, K and Eckert, D and Wolf, M and Muller, KH (2003) Critical properties of the double-exchange ferromagnet Nd(0.6)Pb(0.4)MnO(3). In: Physical Review B: Condensed Matter and Materials Physics, 68 (14). p. 144408.

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Abstract

Results of a study of dc magnetization M(T,H), performed on a Nd(0.6)Pb(0.4)MnO(3) single crystal in the temperature range around T(C) (Curie temperature) which embraces the supposed critical region \epsilon\=\T-T(C)\/T(C)less than or equal to0.05 are reported. The magnetic data analyzed in the critical region using the Kouvel-Fisher method give the values for the T(C)=156.47+/-0.06 K and the critical exponents beta=0.374+/-0.006 (from the temperature dependence of magnetization) and gamma=1.329+/-0.003 (from the temperature dependence of initial susceptibility). The critical isotherm M(T(C),H) gives delta=4.54+/-0.10. Thus the scaling law gamma+beta=deltabeta is fulfilled. The critical exponents obey the single scaling equation of state M(H,epsilon)=epsilon(beta)f(+/-)(H/epsilon(beta+gamma)), where f(+) for T>T(C) and f(-) for T<T(C). The exponent values are very close to those expected for the universality class of three-dimensional Heisenberg ferromagnets with short-range interactions.

Item Type:	Journal Article
Publication:	Physical Review B: Condensed Matter and Materials Physics
Publisher:	The American Physical Society
Additional Information:	Copyright of this article belongs to The American Physical Society.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	08 Aug 2011 07:12
Last Modified:	08 Aug 2011 07:12
URI:	http://eprints.iisc.ac.in/id/eprint/39776

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