Ultrasonic studies on colossal magnetoresistive Nd(0.67)A(0.33)MnO(3) (A = Ca, Sr)

The colossal magnetoresistive material Nd(0.67)A(0.33)MnO(3) (A = Ca, Sr) has been investigated through sound velocity measurements using pulse-transmission method at 1 MHz. Significant hardening of longitudinal velocity below Curie temperature (T(C)) has been observed, which is attributed to signif...

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Published inJournal of alloys and compounds Vol. 424; no. 1-2; pp. 46 - 50
Main Authors Reddy, Y S, Kumar, V Prashanth, Kistaiah, P, Reddy, C Vishnuvardhan
Format Journal Article
LanguageEnglish
Published 09.11.2006
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Summary:The colossal magnetoresistive material Nd(0.67)A(0.33)MnO(3) (A = Ca, Sr) has been investigated through sound velocity measurements using pulse-transmission method at 1 MHz. Significant hardening of longitudinal velocity below Curie temperature (T(C)) has been observed, which is attributed to significant decrease of the static Jahn-Teller distortion of the MnO(6) octahedra due to spin-lattice coupling in this material. The elastic moduli at room temperature have been determined and porosity corrections have been reported. The compositional dependence of elastic moduli is interpreted in terms strength of interatomic bonding, which a consequence of A-site ionic radius (r(A)).
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ISSN:0925-8388
DOI:10.1016/j.jallcom.2005.12.073