Magnetotransport and magnetoresistance properties of Pr 0.68Ca0.32-xSrxMnO3 (x= 0, 0.1, 0.18, 0.26 and 0.32) manganites

Küçük Resim Yok

Tarih

2011

Dergi Başlığı

Dergi ISSN

Cilt Başlığı

Yayıncı

National Institute of Optoelectronics

Erişim Hakkı

info:eu-repo/semantics/closedAccess

Özet

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 6.3x10 8 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.

Açıklama

Anahtar Kelimeler

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

Kaynak

Journal of Optoelectronics and Advanced Materials

WoS Q Değeri

Scopus Q Değeri

Q4

Cilt

13

Sayı

6

Künye