SEMICONDUCTOR-METAL TRANSITION AND MAGNETORESISTANCE IN (LA,CA)MNO3 -EXPERIMENTS AND SIMPLE-MODEL

Authors
PIERRE J ROBAUT F MISAT S STROBEL P NOSSOV A USTINOV V VASSILIEV V
Citation
J. Pierre et al., SEMICONDUCTOR-METAL TRANSITION AND MAGNETORESISTANCE IN (LA,CA)MNO3 -EXPERIMENTS AND SIMPLE-MODEL, Physica. B, Condensed matter, 225(3-4), 1996, pp. 214-224
Citations number
30
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physica. B, Condensed matter → ACNP
ISSN journal
09214526
Volume
225
Issue
3-4
Year of publication
1996
Pages
214 - 224
Database
ISI
SICI code
0921-4526(1996)225:3-4<214:STAMI(>2.0.ZU;2-V
Abstract
The effect of Ca-doping on bulk samples of La1-xCaxMnO3 has been inves tigated, as well as the effect of sample annealing under air and oxyge n. The maximum magnetoresistance is observed for ferromagnetic samples , with La0.67Ca0.33MnO3 composition, annealed at an optimum temperatur e of 1200 degrees C. A simple phenomenological model has been used whi ch describes the magnetic and transport properties as resulting from a n exchange-induced band-crossing SC-metal transition.