engleski

Magnetic field modulation dependence of zero field microwave response in the high-Tc superconductor YBa2Cu3O6.93

Microwave absorption in the vicinity' of zero magnetic field (zero field peak) has been measured for high-Tc superconductor, YBa2Cu3O6.93 at the first and second harmonic of modulation field. The effects observed for small amplitudes of modulation (Hm) have been discussed and related to the model of damped motion of free fluxons. The real component of a complex surface impedence for small Hm has been estimated and correlated with the lineshape of the zero field peak detected at the first harmonic. An anomalous behaviour of the lineshape detected at this harmonic is found to have a source in the dispersion contribution and in the magnetic structure of this material.

superconductors ; low field microwave response

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