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Magnetotransport and magnetoresistance properties of Pr0.68Ca0.32-xSrxMnO3 (x= 0, 0.1, 0.18, 0.26 and 0.32) manganites

T. IZGI1, V. S. KOLAT1, N. BAYRI1, A. O. KAYA1, H. GENCER1,* , S. ATALAY1

Affiliation

  1. Inonu University, Science and Arts Faculty, Physics Department 44069 Malatya, Turkey

Abstract

In this study, the magnetotransport and magnetoresistance properties of Pr0.68Ca0.32-xSrxMnO3 (x= 0, 0.1, 0.18, 0.26 and 0.32) compounds were investigated. The system illustrate an evolution from a charge-ordered manganite at x = 0, with an insulating-like resistivity and low magnetization values, towards to a completely ferromagnetic metallic state for x = 0.32. Above the metal-insulator transition temperature TMI, the resistance curves were fitted to the small polaron popping model. The activation energy (Ea) was found to decrease with increasing Sr content. In the phase separated (PS) state, due to the coexistence of ferromagnetic (FM) metallic and charge order (CO) insulating phases, the magnetoresistance (MR) was found to be maximum. The MR ratio of 6.3x108 for the sample x = 0 at 60 K is one of the largest MR change has been reported in manganites. The MR values decreases considerably with increasing Sr content and the activation energy decreases with the increase of Sr content.

Keywords

Manganites, Colossal magnetoresistance, Transport and magnetic properties, Metal-insulator transition,.

Submitted at: Nov. 24, 2010
Accepted at: June 9, 2011

Citation

T. IZGI, V. S. KOLAT, N. BAYRI, A. O. KAYA, H. GENCER, S. ATALAY, Magnetotransport and magnetoresistance properties of Pr0.68Ca0.32-xSrxMnO3 (x= 0, 0.1, 0.18, 0.26 and 0.32) manganites, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 6, pp. 648-655 (2011)