Abstract
Investigations of the temperature dependences of the magnetic permeability and dielectric permittivity in the temperature range 4.2 K⩽T ⩽300 K and the field dependence of the magnetization M(B) in fields B⩽50 T show that the magnetic properties of the complex (ET)2C60 cannot be described on the basis of the standard model, which assumes that the paramagnetic oxygen impurity makes the dominant contribution. It is found that the magnetism in (ET)2C60 is due to the diamagnetic properties of the C60 and ET molecules and to specific paramagnetic centers of the type C −60 , which possess an anomalously low g factor |g|≈0.14. An experimentum crucis is proposed for checking the oxygen paramagnetic center model for pure C60 films.
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Pis’ma Zh. Éksp. Teor. Fiz. 69, No. 10, 733–738 (25 May 1999)
An erratum to this article is available at http://dx.doi.org/10.1134/1.568172.