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Title: Effect of Y substitution in La-Ca-Mn-O perovskites showing giant magnetoresistance
Authors: Mahendiran, R
Mahesh, R
Raychaudhuri, A K
Rao, C N R
Keywords: La-Ca-Mn-O perovskites
giant magnetoresistance
Issue Date: 1996
Publisher: American Physical Society
Citation: Physical Review B 53(18), 12160-12165 (1996)
Abstract: Substitution of yttrium (Y3+) in La-Ca-Mn-O perovskites of the ABO3 structure markedly affects the crystal structure and lattice constants as well as the resistivity (ρ), ferromagnetic transition temperature (Tc), and the temperature corresponding to the insulator-metal-like transition (Tp). The two important parameters which control the electronic transport and the magnetic behavior are the Mn4+ content and the effective radius of the A-site cation. The substitution by Y, which changes the A-site radius, is compared to pressure effect. For certain Y concentrations we observe substantial enhancement of the negative magnetoresistance at temperatures T<Tc and a large positive magnetoresistance at T≫Tc. © 1996 The American Physical Society
Description: Restricted Access
Other Identifiers: 0163-1829
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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