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Title: Magnetic Structure and Giant Magnetoresistance of Ferromagnetic La1−δMn1−δO3—An Example of Double-Exchange Striction?
Authors: Cheetham, A K
Rao, C N R
Vogt, T
Keywords: Defect Structure
Issue Date: 1-Nov-1996
Publisher: Academic Press Inc
Citation: Journal Of Solid State Chemistry 126(2), 337-341 (1996)
Abstract: A neutron powder diffraction study of the structure of the rhombohedral phase of La1−δMn1−δO3(δ = 0.04) as a function of temperature has been carried out. The crystal structure is well described at all temperatures by a model inR− 3c(a= 5.52264(5) andc= 13.3309(5) at 300 K) and the low temperature data contain magnetic contributions to the Bragg scattering due to ferromagnetic ordering below Tc∼ 200 K. The spin is canted at approximately 45° from [001]. The Mn–O–Mn angle decreases on cooling toTc, but shows a slight increase on further cooling, presumably due to the onset of a double-exchange striction effect. Resistivity and magnetization data corroborate the neutron findings and reveal an insulator to metal transition close toTcwith a negative giant magnetoresistance value of ∼50% at this temperature. The results confirm the striking similarity between the structural, magnetic, and conducting properties of rhombohedral La1−δMn1−δO3and those of the solid solution La1−xAxMnO3(x∼ 0.3).
Description: Letter. Restricted Access.
Other Identifiers: 0022-4596
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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