1D-3D crossover in hopping conduction of carbynes |
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| Authors: | S V Demishev A A Pronin N E Sluchanko N A Samarin A G Lyapin V V Brazhkin T D Varfolomeeva S V Popova |
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| Institution: | (1) Institute of General Physics, Russian Academy of Sciences, ul. Vavilova 38, Moscow, 117942, Russia;(2) Institute of High-Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow region, 142092, Russia |
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| Abstract: | D.C. and A.C. conductivities of carbyne samples were studied over the temperature range 1.8–300 K at frequencies 10 MHz–1 GHz. It was established that a variation in the fraction of sp 2 bonds in carbynes induces transition from one-to two-and then to three-dimensional conduction. In the one-dimensional hopping conduction regime, the resistivity of carbynes depends on temperature as ρ=ρ0exp(T 0/T)1/2], whereas Coulomb correlations are insignificant. The Hunt model of one-dimensional A.C. conductivity is experimentally confirmed. |
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