Effects of Weak Links in the Nonlinear Microwave Response of MgB2 Superconductor

Details Effects of Weak Links in the Nonlinear Microwave Response of MgB2 Superconductor Effects of Weak Links in the Nonlinear Microwave Response of MgB2 Superconductor

2006-06-22

arxiv.org/abs/cond-mat/0606576v1

J. Supercond. 20 (2007) 13-20

Physics

Condensed Matter

Superconductivity

14 pages, 4 figures, 1 table; Proceedings of 9th Symposium of High Temperature Superconductors in High Frequency Fields (25-28

Scientific paper

10.1007/s10948-006-0196-1

We report experimental results of second-harmonic (SH) response at microwave frequency in several ceramic MgB2 samples, prepared by different methods. The SH signal has been investigated as a function of the temperature and DC magnetic field. The investigation has been carried out at low magnetic fields, where nonlinear processes arising from motion of Abrikosov fluxons are ineffective. We show that the low-temperature SH emission is ascribable to processes involving weak links. Comparison among the peculiarities of the SH signal radiated by the different samples shows that the presence of weak links strongly depends on the sample preparation method, as well as the purity and morphology of the components used for the preparation.

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