Reference : Anomalous temperature behavior of the resistivity in lightly doped manganites around ...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Chemistry
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/2268/140312
Anomalous temperature behavior of the resistivity in lightly doped manganites around a metal-insulator phase transition
English
Sergeenkov, S. [SUPRAS, Institute of Physics, B5, University of Liège, B-4000 Liège, Belgium, Bogoliubov Lab. of Theor. Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation]
Ausloos, Marcel [Université de Liège - ULiège > Département de physique > Département de physique >]
Bougrine, Hassan [Université de Liège - ULiège > CARE "Le Réseau des bibliothèques" > Bibliothèque des Sciences et Techniques >]
Rulmont, André mailto [Université de Liège - ULiège > Département de chimie (sciences) > Département de chimie (sciences) >]
Cloots, Rudi [Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT >]
1999
JETP Letters
Springer Science & Business Media B.V.
70
7
481-487
Yes (verified by ORBi)
International
0021-3640
[en] An unusual temperature and concentration behavior of the resistivity ρ(T,x) in La0.7Ca0.3Mn1-xCuxO3 is observed at slight Cu doping (0 ≤x≤ 0.05). Namely, the introduction of copper results in a splitting of the resistivity maximum around the metal-insulator transition temperature T0(x) into two differently evolving peaks. Unlike the original Cufree maximum, which steadily increases with doping, the second (satellite) peak remains virtually unchanged for x<xc, increases for x≥xc, and finally disappears at xm ≃ 2xc, with xc ≃ 0.03. The observed phenomenon is thought to arise from a competition between substitution-induced strengthening of the potential barriers (which hinder the charge hopping between neighboring Mn sites) and weakening of the kinetic energy of the carriers. The data are well fitted by assuming a nonthermal tunneling conductivity theory with randomly distributed hopping sites. © 1999 American Institute of Physics.
http://hdl.handle.net/2268/140312

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