Open AccessGIANT MAGNETORESISTANCE EFFECT OF THE La1-xCaxMnO3 SYSTEM
Author(s) -
Yang Ruan,
Jingsong Wang,
Z. A. Xu,
Zhengkuan Jiao,
Qirui Zhang
Publication year - 1997
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.46.1415
Subject(s) - magnetoresistance , electrical resistivity and conductivity , condensed matter physics , colossal magnetoresistance , materials science , giant magnetoresistance , crystallite , ion , zener diode , magnetic field , physics , voltage , quantum mechanics , resistor , metallurgy
The electrical resistivity ( ρ ) and magnetoresistance of polycrystalline pellets of La1-xCaxMnO3 were measured in the 10—300K range in magnetic fields up to 1.8T. It was found that when x increases, both the peak of the electrical resistivity and the peak of magnetoresistance occurs at lower temperatures.The authors suggested that the change of x results in the change of proportion of Mn4+ ions.Variation of the proportion of Mn4+ ions leads to the change of magnetic structure of La1-xCaxMnO3.Zener's model of double exchange coupling can be used to explain the experimental results.