Open AccessSTUDY OF GIANT MAGNETORESISTANCE IN THE In-SUBSTITUTED (La2/3Ca1/3)(Mn(3-2x)/3In2x/3)O3 SYSTEM
Author(s) -
Xu Ming-Xiang,
Zhengkuan Jiao
Publication year - 1998
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.47.1006
Subject(s) - magnetoresistance , electrical resistivity and conductivity , materials science , condensed matter physics , manganese , ferromagnetism , manganite , valence (chemistry) , colossal magnetoresistance , giant magnetoresistance , ion , magnetic field , chemistry , physics , metallurgy , organic chemistry , quantum mechanics
The In-substituted system,(La2/3Ca1/3)(Mn(3-2x)/3In2x/3)O3(x=0.000.100.15),was synthesized by solid-state reaction method.Its temperature dependence of electrical resistance and magnetoresistance (H=0,1.6T) and field dependence of magnetoresistance were measured by the four-probe method.It was found that when x increases,both the peak of the electrical resistivity and the peak of magnetoresistance move to lower temperatures.However,the cusp is broadened by In-substitution.The authors suggested that the variation of the proportion of In3+ ions leads to the change of manganese valence and the magnetic moments,as well as magnetic structure of the (La2/3Ca1/3)(Mn(3-2x)/3In2x/3)O3 system.Such phenomena weaken the ferromagnetic double exchange effect.