# Effect of Y substitution in La-Ca-Mn-O perovskites showing giant magnetoresistance

Mahendiran, R and Mahesh, R and Raychaudhuri, AK and Rao, CNR (1996) Effect of Y substitution in La-Ca-Mn-O perovskites showing giant magnetoresistance. In: Physical Review B, 53 (18). pp. 12160-12165.

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## Abstract

Substitution of yttrium $(Y^{3+})$ in La-Ca-Mn-O perovskites of the $ABO_3$ structure markedly affects the crystal structure and lattice constants as well as the resistivity $(\rho)$, ferromagnetic transition temperature $(T_c)$, and the temperature corresponding to the insulator-metal-like transition $(T_p)$. The two important parameters which control the electronic transport and the magnetic behavior are the $Mn^{4+}$ 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 $T<T_c$ and a large positive magnetoresistance at $T\gg T_c$ .

Item Type: Journal Article Physical Review B The American Physical Society Copyright of this article belongs to The American Physical Society. Division of Chemical Sciences > Solid State & Structural Chemistry UnitDivision of Physical & Mathematical Sciences > Physics 18 Jan 2007 19 Sep 2010 04:33 http://eprints.iisc.ac.in/id/eprint/9170