Low Temperature Physics: 42, 119 (2016); https://doi.org/10.1063/1.4942229
Fizika Nizkikh Temperatur: Volume 42, Number 2 (February 2016), p. 159-168    ( to contents , go back )

Magnetic phase and relaxational phenomena in fullerite C60

J.G. Chigvinadze1, V. Buntar2, S.M. Ashimov1, and A.V. Dolbin3

1E. Andronikashvili Institute of Physics, 6 Tamarashvili Str., Tbilisi 0177, Georgia

2Department of Physics and Astronomy, McMaster University, 1280 Main Str. W., Hamilton L8S 4M1, Canada

3B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: dolbin@ilt.kharkov.ua
pos Анотація:

Received September 21, 2015

Abstract

The magnetic properties of fullerite C60 (99.98%) have been investigated in dynamic and static experiments in the temperature interval 77–300 K using high-sensitivity torsion vibration technique. The peaks of vibrational energy absorption are related to the phase transformations and the reformation of the magnetic structure of C60 have been registered at T = 152, 195, 230, and 260 K. The magnetic relaxation pro-cesses in fullerite C60 have been investigated at room temperature. On switching on an external longitudinal or transverse magnetic field, the motionless C60 sample freely suspended by an elastic filament rotated "spontaneously". The direction of the "spontaneous" rotation was changing with time. It is assumed that the observed phenomena are caused by the relaxation processes in the rotational subsystem of the molecular ro-tators of C60 and by the C60-trapped magnetic flux and weakly attenuating eddy currents induced by the applied magnetic field in the sample.

PACS: 75.75.–c Magnetic properties of nanostructures;
PACS: 76.60.Es Relaxation effects.

Key words: fullerite C60, magnetic phase, torsion vibration technique, trapped magnetic flux, molecular rotators.

Published online: December 23, 2015

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