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Unusual behavior of the magnetoresistance of boron carbonitride films at low temperature

Published online by Cambridge University Press:  31 January 2011

L. Filipozzi ,
L. Piraux ,
A. Marchand ,
A. Derré ,
A. Adouard  and
M. Kinany-Alaoui
L. Filipozzi
Affiliation:
CNRS–Centre de Recherche Paul Pascal, Université Bordeaux I, avenue du Dr Schweitzer, 33600 Pessac, France
L. Piraux*
Affiliation:
Laboratoire de Physico-Chimie et de Physique des Matériaux, Département des Sciences des Matériaux et des Procédés, Université Catholique de Louvain, Place Croix du Sud, 1 B-1348 Louvain-la-Neuve, Belgique
A. Marchand
Affiliation:
CNRS–Centre de Recherche Paul Pascal, Université Bordeaux I, avenue du Dr Schweitzer, 33600 Pessac, France
A. Derré
Affiliation:
CNRS–Centre de Recherche Paul Pascal, Université Bordeaux I, avenue du Dr Schweitzer, 33600 Pessac, France
A. Adouard
Affiliation:
CNRS–Université Paul Sabatier–INSA, Service National des Champs Magnétiques Pulsés, Complexe Scientifique de Rangueil, 31077 Toulouse, France
M. Kinany-Alaoui
Affiliation:
Laboratoire de Physico-Chimie et de Physique des Matériaux, Département des Sciences des Matériaux et des Procédés, Université Catholique de Louvain, Place Croix du Sud, 1 B-1348 Louvain-la-Neuve, Belgique
*
a)Author to whom all correspondence should be addressed.
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Abstract

We have performed resistivity and magnetoresistance measurements down to 0.3 K, and under fields up to 37 T of boron carbonitride and BC3 films prepared by chemical vapor deposition. The turbostratic structure of the as-deposited materials favors a 2D weak localization effect which is invoked to explain the negative magnetoresistance (MR) as well as the log T variation of the resistivity. However, at very low temperature a positive component is superimposed on the negative MR. At high fields, the total MR is positive and almost isotropic. Usual theories are unable to account for the observed phenomenon. Increasing heat treatments up to 1800 °C increase the 2D character of the deposits, which show an increasingly negative magnetoresistance. For still higher treatments, the change of the films to a 3D graphitic-like structure leads to a vanishing of the negative magnetoresistance.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 7 , July 1997 , pp. 1711 - 1721
Copyright
Copyright © Materials Research Society 1997

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References

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