Microwave Second-Harmonic Response of Ceramic MgB2 Samples

Details Microwave Second-Harmonic Response of Ceramic MgB2 Samples Microwave Second-Harmonic Response of Ceramic MgB2 Samples

2005-05-26

arxiv.org/abs/cond-mat/0505653v1

Physica C 432 (2005) 306-314

Physics

Condensed Matter

Superconductivity

16 pages, 8 figures, submitted to Physica C

Scientific paper

10.1016/j.physc.2005.09.007

Nonlinear microwave response of different ceramic MgB2 samples has been investigated by the technique of second-harmonic emission. The second-harmonic signal has been investigated as a function of temperature, DC magnetic field and input microwave power. The attention has mainly been devoted to the response at low magnetic fields, where nonlinear processes arising from motion of Abrikosov fluxons are ineffective. The results show that different mechanisms are responsible for the nonlinear response in the different ranges of temperature. At low temperatures, the nonlinear response is due to processes involving weak links. At temperatures close to Tc, a further contribution to the harmonic emission is present; it can be ascribed to modulation of the order parameter by the microwave field and gives rise to a peak in the temperature dependence of the harmonic signal.

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