Effect of substitution of Mn3+ by other trivalent cations on the colossal magnetoresistance and related properties of the manganates:$ La_{0.7}A_{0.3}Mn_{1-x}M_{x}O_{3}$ (A = Ca, Sr, Pb; M = Al, Cr, Fe, Co)

Sugantha, M and Singh, RS and Guha, A and Raychaudhuri, AK and Rao, CNR (1998) Effect of substitution of Mn3+ by other trivalent cations on the colossal magnetoresistance and related properties of the manganates:$ La_{0.7}A_{0.3}Mn_{1-x}M_{x}O_{3}$ (A = Ca, Sr, Pb; M = Al, Cr, Fe, Co). In: Materials Research Bulletin, 33 (07). pp. 1129-1134.

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Abstract

Investigations of the manganates of the general formula La(0.7)A(0.3)Mn(1-x)M(x)O(3) with A = Ca, Sr, or Pb and M = Al, Cr, Fe, or Co in the x range 0.00-0.20 have shown that the ferromagnetic T-c and the insulator-metal transition temperature, T-p, generally decrease with increase in x, accompanied by an increase in the resistivity at T-p The value of the saturation magnetization and, hence, the saturation moment also decrease with increase in x. The magnitude of magnetoresistance is generally smaller in the Fe and Co substituted systems when A = Pb. However, with A Sr, we find enhanced colossal magnetoresistance in the 50-250 K range when x = 0.1 for M Fe and Co. Interestingly, these systems exhibit a nearly flat resistivity curve over this temperature range

Item Type:	Journal Article
Publication:	Materials Research Bulletin
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	oxides;X-ray diffraction;electrical properties;magnetic properties.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit Division of Physical & Mathematical Sciences > Physics
Date Deposited:	02 Jun 2009 07:02
Last Modified:	19 Sep 2010 05:02
URI:	http://eprints.iisc.ac.in/id/eprint/18484

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