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STRONG NEGATIVE MAGNETORESISTANCE AND HOPPING TRANSPORT IN GRAPHENIZED NEMATIC AEROGELS

V. I. Tsebro 1, 2
V. I. Tsebro
, 
E. G. Nikolaev 2
E. G. Nikolaev
, 
M. S. Kutuzov 3
M. S. Kutuzov
, 
A. V. Sadakov 1
A. V. Sadakov
, 
O. A. Sobolevski 1
O. A. Sobolevski
10.31857/S00444510240212e2
Published 2023-11-10
Article , Volume 165, Issue 2, 255-264
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Tsebro V. I. et al. STRONG NEGATIVE MAGNETORESISTANCE AND HOPPING TRANSPORT IN GRAPHENIZED NEMATIC AEROGELS // Journal of Experimental and Theoretical Physics. 2023. Vol. 165. No. 2. pp. 255-264.
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Tsebro V. I., Nikolaev E. G., Kutuzov M. S., Sadakov A. V., Sobolevski O. A. STRONG NEGATIVE MAGNETORESISTANCE AND HOPPING TRANSPORT IN GRAPHENIZED NEMATIC AEROGELS // Journal of Experimental and Theoretical Physics. 2023. Vol. 165. No. 2. pp. 255-264.
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TY - JOUR
DO - 10.31857/S00444510240212e2
UR - https://jetp.colab.ws/publications/10.31857/S00444510240212e2
TI - STRONG NEGATIVE MAGNETORESISTANCE AND HOPPING TRANSPORT IN GRAPHENIZED NEMATIC AEROGELS
T2 - Journal of Experimental and Theoretical Physics
AU - Tsebro, V. I.
AU - Nikolaev, E. G.
AU - Kutuzov, M. S.
AU - Sadakov, A. V.
AU - Sobolevski, O. A.
PY - 2023
DA - 2023/11/10
PB - Nauka Publishers
SP - 255-264
IS - 2
VL - 165
ER -
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@article{2023_Tsebro,
author = {V. I. Tsebro and E. G. Nikolaev and M. S. Kutuzov and A. V. Sadakov and O. A. Sobolevski},
title = {STRONG NEGATIVE MAGNETORESISTANCE AND HOPPING TRANSPORT IN GRAPHENIZED NEMATIC AEROGELS},
journal = {Journal of Experimental and Theoretical Physics},
year = {2023},
volume = {165},
publisher = {Nauka Publishers},
month = {Nov},
url = {https://jetp.colab.ws/publications/10.31857/S00444510240212e2},
number = {2},
pages = {255--264},
doi = {10.31857/S00444510240212e2}
}
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Tsebro, V. I., et al. “STRONG NEGATIVE MAGNETORESISTANCE AND HOPPING TRANSPORT IN GRAPHENIZED NEMATIC AEROGELS.” Journal of Experimental and Theoretical Physics, vol. 165, no. 2, Nov. 2023, pp. 255-264. https://jetp.colab.ws/publications/10.31857/S00444510240212e2.
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Keywords

graphenized aerogels
hopping transport
negative magnetoresistance
weak localization,

Abstract

The transport properties of nematic aerogels, which consist of oriented mullite nanofibers coated with a graphene shell, were studied. It is shown that the magnetoresistance of this system is well approximated by two contributions – negative one, described by the formula for systems with weak localization, and positive contribution, linear in the field and unsaturated in large magnetic fields. The behavior of phase coherence length on temperature obtained from the analysis of the negative contribution indicates the main role of the electron-electron interaction in the destruction of phase coherence and, presumably, the transition at low temperatures from a two-dimensional weak localization regime to a one-dimensional one. The positive linear contribution to magnetoresistance is apparently due to the inhomogeneous distribution of the local carrier density in the conductive medium. It has also been established that the temperature dependence of the resistance for graphenized aerogels with a low carbon content, when the graphene coating is apparently incomplete, can be represented as the sum of two contributions, one of which is characteristic of weak localization, and the second is described by hopping mechanism corresponding to the Efros-Shklovskii law in the case of a granular conductive medium. For samples with a high carbon content, there is no second contribution.

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