Magnetoresistance of the spin-state-transition compound La{sub 1{minus}{ital x}}Sr{sub {ital x}}CoO{sub 3}

Journal Article · Sun Dec 01 04:00:00 EST 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.54.16044· OSTI ID:399820

Mahendiran, R; Raychaudhuri, A K ^[1]

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1. Department of Physics, Indian Institute of Science, Bangalore--560 012 (India)

We have investigated the magnetoresistance (MR) of the perovskite oxide La{sub 1{minus}{ital x}}Sr{sub {ital x}}CoO{sub 3} for 0 {le}{ital x}{le}0.4 which shows a spin-state transition from low-spin Co{sup III} to high-spin Co{sup 3+} as a function of temperature. In the metallic compositions ({ital x}{ge}0.25) appreciable MR occurs only near the ferromagnetic Curie temperature. For the most metallic composition {ital x}=0.4, there is a small positive contribution to the MR near the {ital T}{sub {ital c}}. In the insulating samples ({ital x}{le}0.2) the MR shows a large hysteresis which depends on the temperature. The value of the MR is negative and large in the insulating compositions and shows a maximum near the temperature where magnetic studies showed a spin-glass-like transition. We also find a strong role of the spin-state transition of the Co{sup 3+} ions in the electronic transport leading to a characteristic behavior of the MR in the Co{sup 3+}-rich insulating samples. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 399820
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 22 Vol. 54; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COBALT OXIDES
ELECTRONIC STRUCTURE
EXCHANGE INTERACTIONS
FERROMAGNETIC MATERIALS
LANTHANUM OXIDES
MAGNETIC PROPERTIES
MAGNETORESISTANCE
PHASE TRANSFORMATIONS
STRONTIUM OXIDES
SUBSTITUTION
TEMPERATURE DEPENDENCE