Abstract
The conductivity, thermopower, and magnetoresistance of carbynes structurally modified by heating under a high pressure are investigated in the temperature range 1.8–300 K in a magnetic field up to 70 kOe. It is shown that an increase in the synthesis temperature under pressure leads to a transition from 1D hopping conductivity to 2D and then to 3D hopping conductivity. An analysis of transport data at T ≤ 40 K makes it possible to determine the localization radius a ∼ (56−140) Å of the wave function and to estimate the density of localized states g(E F) for various dimensions d of space: g(E F) ≈ 5.8 × 107 eV−1 cm−1 (d=1), g(E F) ≈5×1014 eV−1 cm −2 (d=2), and g(E F)≈1.1×1021 eV−1 cm−3 (d=3). A model for hopping conductivity and structure of carbynes is proposed on the basis of clusterization of sp 2 bonds in the carbyne matrix on the nanometer scale.
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Translated from Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 122, No. 1, 2002, pp. 140–149.
Original Russian Text Copyright © 2002 by Demishev, Pronin, Glushkov, Sluchanko, Samarin, Kondrin, Lyapin, Brazhkin, Varfolomeeva, Popova.
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Demishev, S.V., Pronin, A., Glushkov, V.V. et al. Hopping conductivity of carbynes modified under high pressures and temperatures: Galvanomagnetic and thermoelectric properties. J. Exp. Theor. Phys. 95, 123–131 (2002). https://doi.org/10.1134/1.1499910
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DOI: https://doi.org/10.1134/1.1499910