Anomalous behavior of C-60(+) to EPR signal in a composite C-60 :Er3+ is St
udied at low temperatures 1.7 K < T < 77 K. The line width Delta H and reso
nance fields of EPR line have a specific temperature dependence and signifi
cant anisotropy tightly connected with the shape of the sample. The data re
flect new ferromagnetic properties induced by Er3+ ions. (C) 2000 Elsevier
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