Two-dimensional weak localization in partially graphitic carbons

V. Bayot, L. Piraux, J.-P. Michenaud, J.-P. Issi, M. Lelaurain, and A. Moore
Phys. Rev. B 41, 11770 – Published 15 June 1990
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Abstract

The weak-localization phenomenon for two-dimensional (2D) electronic systems is invoked to explain the negative magnetoresistance as well as the low-temperature dependence of the resistivity of pyrocarbon samples heat treated between 2000 and 2600 °C. The 2D character is found to originate from the random stacking of the graphene layers (turbostratic structure) characteristic of pregraphitic carbon materials. For a heat-treatment temperature (HTT) lower than 2200 °C, x-ray analysis reveals that the structure is almost turbostratic, while the material exhibits a pronounced negative magnetoresistance. For higher HTT, 3D order typical of crystalline graphite increases, leading to a 2D-to-3D crossover and to a vanishing negative magnetoresistance.

  • Received 13 February 1990

DOI:https://doi.org/10.1103/PhysRevB.41.11770

©1990 American Physical Society

Authors & Affiliations

V. Bayot, L. Piraux, J.-P. Michenaud, and J.-P. Issi

  • Unité 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, Belgium

M. Lelaurain

  • Laboratoire de Chimie du Solide Minéral, L 158, Service de Chimie Minérale Appliquée
  • Université de Nancy I, Boîte Postale 239, 54506 Vandoeuvre-les-Nancy CEDEX, France

A. Moore

  • Union Carbide Corporation, Parma Technical Center, P.O. Box 6116, Cleveland, Ohio 44101

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Issue

Vol. 41, Iss. 17 — 15 June 1990

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