J. Phys. I France 2 (1992) 517-522
Conductivity coherence peak in YBa 2Cu 3O 7O. Klein1, K. Holczer1, G. Grüner1 and G.A. Emelchenko2
1 UCLA, Department of Physics, Los Angeles, CA 90024, U.S.A.
2 Academy of Sciences, 142432 Chernogolovka, Moscow, Russia
(Received 20 January 1992, accepted in final form 6 March 1992)
We have measured both the surface resistance and the surface reactance of a YBa 2Cu 3O 7 single crystal at millimeter wave frequencies and have evaluated the conductivity . We observe a narrow coherence peak below which indicates s-wave pairing with a rapid opening of the single particle gap.
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