Conductivity of nanotubes at pressures 20 - 50 GPa

Ya.Volkova, E.Obraztsova^*), V.Morev, G. Tikhomirova, A. Babushkin

Physics Department, Ural State University, Ekaterinburg, Russia
*) Institute of General Physics RAS, Moscow, Russia

At pressure 20-50 GPa the conductivity of one-wall nanotubes is
studied.
High pressures have been generated in the high pressure cell with
synthetic carbonado-type diamond anvils of the "rounded cone-plane"
type. The anvils are good conductors and can be used as electric
contacts making possible to measure temperature and pressure
dependences of resistance. The estimation of pressure was proved to be
accurate based on extensive studies of different materials in a wide
range of temperatures and pressures. The error of the estimation
depends on mechanical properties of the compressed material and is
less than 10% in the range of 15 to 50 GPa. The sample were of ť 0.2
mm diameter and thickness from 5 to 30 mm.
It is revealed, that in temperature range 77 - 300 K conductivity has
activation nature.
For the first time is founded that at pressure 35-40 GPa there are
features in behavior of activation energy and mobility of charge
carriers. The features of properties of nanotubes at such pressure are
found for the first time. At pressure decrease of a feature in
behavior of the electrophysical characteristics are saved. The
observed effects are probably connected with partial destruction of
nanotubes with formation of pieces of the large sizes.

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