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Structural and magnetic properties of Al doped Y2CaMn3O9 perovskites

I. BALASZ1,* , E. BURZO1

Affiliation

  1. Faculty of Physics, Babes-Bolyai University, 1 M. Kogalniceanu Str., 400084, Cluj-Napoca, Romania

Abstract

The Y2CaMn3-xAlxO9 perovskites crystalize in an orthorhombic type structure having Pnma-space group. The magnetic measurements show the presence of spin-glass type behavior. The maxima in the temperature dependences of the magnetization in ZFC sample, decrease from Tm= 30 K (x=0) to 18.9 K (x=0.6). The magnetization isotherms in field up to 90 kOe show that the saturation is not obtained. Above TSRF temperature, Curie-Weiss type behavior was evidenced. The number of Mn4+ ions increases as Mn is substituted by Al. In the temperature range Tc < T < TSRF ferromagnetically ordered clusters are coupled by random dipolar interactions..

Keywords

Manganite, Spin-glass, Crystal structure, Magnetic properties.

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

Citation

I. BALASZ, E. BURZO, Structural and magnetic properties of Al doped Y2CaMn3O9 perovskites, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 2, pp. 473-475 (2006)