The magnetic susceptibility chi of pristine and brominated arc-produced sample of multiwall carbon nanotubes was measured from 4.2 to 400 K. An additional contribution Deltachi(T) to diamagnetic susceptibility chi(T) of carbon nanotubes was found at T < 50 K for both samples. It is shown that Deltachi(T) are dominated by quantum correction to chi for interaction electrons (interaction effects-IE). The IE shows a crossover from two-dimensional to three-dimensional at B = 5.5 T. The effective interaction between electron, for interior layers of nanotubes has been found to be repulsive and the electron-electron interaction lambda(c) was estimated to be lambda(c) similar to 0.26. (C) 2002 Elsevier Science Ltd. All rights reserved. References: 20
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