IV-R-3 Superconductivity in Sodium-Hydrogen-C₆₀ Ternary Compound

Kenichi IMAEDA, Jonas KRÖBER, Hiroo INOKUCHI, Yukako YONEHARA* and Kenji ICHIMURA* (*Kumamoto Univ.)

[Synth. Met. 85, 1575 (1997)]

The magnetic properties of the superconducting sodium-hydrogen-C₆₀ ternary compound have been investigated by means of SQUID and ESR. The superconducting parameters (the penetration depth (lambda) and the coherence length (xi)) are estimated to be (kambda)=2800 Å and (xi)=38 Å using H_c1(0)=90 G and H_c2(0)=22 T. The spin susceptibility and the ESR linewidth decrease sharply below ~250 K, suggesting the presence of some phase transition.

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