Open AccessMechanism of magnetoresistance impacted by Co doped in La0.8Sr0.2MnO3 ferromagnetic metallic
Author(s) -
J.H. Kuo
Publication year - 2010
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.59.2801
Subject(s) - magnetoresistance , condensed matter physics , ferromagnetism , antiferromagnetism , curie temperature , materials science , colossal magnetoresistance , magnetic moment , doping , exchange interaction , saturation (graph theory) , giant magnetoresistance , metal , magnetic field , physics , metallurgy , mathematics , quantum mechanics , combinatorics
Through measurement of saturation magnetic moment and transport of La0.8Sr0.2Mn1-yCoyO3 (y≤02), the mechanism of magnetoresistance (MR) impacted by Co doping is investigated. The results show that Co3+ is in the low-spin state in La0.8Sr0.2 Mn1-yCoyO3(y≤02). The magnetic exchange interactions of the type Mn3+—O—Co3+—O—Mn3+ is weaker than that of the double exchange interaction between Mn3+-Mn4+, and the magnetoresistance near the Curie temperature TC decreases with the increase of Co concentration. On the contrary, low-temperature magnetoresistance increases with the increase of Co concentration owing to the antiferromagnetic exchange coupling between Co2+ and eg itinerant electron.