The magnetic properties of the superconducting sodium-hydrogen-C-60 te
rnary compound have been investigated by means of SQUID and ESR. The s
uperconducting parameters (the penetration depth lambda and the cohere
nce length xi) are estimated to be lambda=2800 Angstrom and xi=38 Angs
trom using H-cl(0)=90 G and H-c2(0)=22 T. The spin susceptibility and
the ESR linewidth decrease sharply below similar to 250 K, suggesting
the presence of some phase transition.