Affordable Access

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)

Authors
Publisher
Elsevier Science
Publication Date
Keywords
  • Solid State & Structural Chemistry Unit
  • Physics
Disciplines
  • Physics

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

There are no comments yet on this publication. Be the first to share your thoughts.