Nanocomposites and nanomaterials

Low-temperature magnetotransport properties of single-walled carbon nanotubes bundles

V. V. Vainberg, V. N. Poroshin, A.S. Pylypchuk, I.I. Yaskovets, N.A. Tripachko
Institute of Physics NASU, Pr. Nauki 46, 03028 Kiev, Ukraine

Experimental studies of the resistance in single-walled carbon nanotube bundles in a magnetic field H up to 45 kGs at 4.2 K are presented in this paper. In this range of magnetic fields, the relative change in the resistance Ñ(H)/(0) in a transverse magnetic field is negative and is described by the dependence Ñ(H)/(0) = -а1Н + а2Н2. The coefficients a1 and a2 are determined by the parameters of the conduction mechanism in the temperature region under study. The measured dependences of the resistance on temperature in the temperature range T ≤ 35 K are described by the dependence  (T) µ  exp ((TM / T) 1/4). In the region of higher temperatures, the resistance depends on the temperature in a power-law manner, which is characteristic of a quasi-one-dimensional electron subsystem in the phase of the Luttinger liquid (LL).
 The found value of  TM allows us to determine the lengths of localization of electronic states in the quasi-one-dimensional nanotube system under investigation and calculate the coefficients a1 and a2. The numerical values ​​of a1 and a2 found agree satisfactorily with those found from the experimental dependence of  Ñ(H)/(0). Thus, it is possible to give a consistent description of the electro- and magnetotransport phenomena in quasi-one-dimensional structures of carbon nanotube bundles.