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Zr-substitution effects on physical properties of the colossal magnetoresistance compounds La2/3Sr1/3MnO3

R. V. TETEAN1,* , I. G. DEAC1, N. BUCUR1, E. BURZO1

Affiliation

  1. Faculty of Physics, "Babes-Bolyai" University, 400084 Cluj-Napoca, Romania

Abstract

We present a detailed study of the polycrystalline perovskite manganites La2/3Sr1/3ZrxMn1-xO3 (x = 0, 0.1, 0.15, 0.2, 0.25, 0.3) at low temperatures and high magnetic fields, including electrical resistance, and magnetization. The static magnetic susceptibility was also measured up to 900 K. All the samples show large negative magnetoresistance behavior. The Curie temperatures decrease with Zr doping. Our results show the decrease of Mn4+/Mn3+ ratio, and this lead to the decrease of the number of ferromagnetic Mn4+- O - Mn3+ interaction. The data suggest that the magnetoresistance of the system is dominated by intergranular effects, but some intrinsic effects have also to be considered, as the temperature approach Tc. This appears to be a consequence of the structural and magnetic disorder created by the random distribution of Zr atoms..

Keywords

Colossal magnetoresistance, Manganites, Curie temperatures, Intergranular magnetoresistivity.

Submitted at: Jan. 18, 2006
Accepted at: March 23, 2006

Citation

R. V. TETEAN, I. G. DEAC, N. BUCUR, E. BURZO, Zr-substitution effects on physical properties of the colossal magnetoresistance compounds La2/3Sr1/3MnO3, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 2, pp. 464-466 (2006)