RESEARCH ON ELECTROMAGNETIC PROPERTIES OF Pr0.4Ca0.6-XSrxMnO3 COMPOUND IMPLEMENTED BY THE SOLID STATE REACTION METHOD

Pham The Tan; Vu Thi Kim Lien

Pham The Tan Hung Yen University of Technology and Education
Vu Thi Kim Lien University of Fire Prevention and Fighting

Keywords: Charge-ordering, ferromagnetic-paramagnetic, perovskite, double-exchange

Abstract

In this paper, we research the change in structure and electromagnetic properties of Pr_0.4Ca_0.6-xSr_xMnO₃ compound, in which Sr (x = 0.0; 0.3; 0.5) substituted for Ca. The samples were prepared by solidphase reaction method. Structural analysis showed that the sample is single-phase and an orthorhomobic structure of the symmetric Pnma group. The magnetic properties of samples increased according to concentrations of Sr doped, it indicated that the double-exchange interaction was more dominant in Srdoped samples. At a given temperature, the resistivity of Sr-doped samples decreased compared to those without Sr. It is observed that the charge ordering phase was stransited at T_CO (~ 270 K) in Pr_0.4Ca_0.6MnO₃, and the same phenomenon in other samples, but lower TCO (265 K in Pr_{0 .4}Ca_0.3 Sr_0.3MnO₃ and 175 K in Pr_0.4Ca_0.1Sr_0.5MnO₃).

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