Mechanism of magnetoresistance impacted by Co doped in La0.8Sr0.2MnO3 ferromagnetic metallic | Zendy

Jiang Kuo | Zendy

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Mechanism of magnetoresistance impacted by Co doped in La0.8Sr0.2MnO3 ferromagnetic metallic

Author(s) -

Jiang Kuo

Publication year - 2010

Publication title -

acta physica sinica

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.

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