Local structure and destruction of electron pathway effects on Curie temperature of B -site-substituted lanthanum manganites

A study of B -site-substituted La 0.7 Ca 0.3 Mn 1 − x Sc x O 3 lanthanum manganites is presented. Substitution of Sc 3 + ion for Mn 3 + ion damages a path of motion of itinerant e g electrons, thus causing a weakening of double-exchange interaction and a decrease of Curie temperature, T C (about 35...

Full description

Saved in:
Bibliographic Details
Published in:Journal of applied physics 2005-05, Vol.97 (10), p.10H702-10H702-3
Main Authors: Ulyanov, A. N., Yu, Seong-Cho
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A study of B -site-substituted La 0.7 Ca 0.3 Mn 1 − x Sc x O 3 lanthanum manganites is presented. Substitution of Sc 3 + ion for Mn 3 + ion damages a path of motion of itinerant e g electrons, thus causing a weakening of double-exchange interaction and a decrease of Curie temperature, T C (about 35 K for each 1% Sc doping from x = 0 to 0.03). We suggest that the observed strong decrease of the T C with x is mostly caused by a difference in an electron configuration of the Mn 3 + and Sc 3 + ions and partially due to a change in the local parameters of the Mn O 6 octahedra because of the larger Sc 3 + ion than the Mn 3 + one. A method for distinguishing the effect of the above two factors on Curie temperature is supposed.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1846272