Near-T c second-harmonic emission in high-density bulk MgB 2 at microwave frequency

A. Agliolo Gallitto, G. Bonsignore, G. Giunchi and M. Li Vigni ()

The European Physical Journal B: Condensed Matter and Complex Systems, 2006, vol. 51, issue 4, 537-542

Abstract: We discuss the microwave second-harmonic generation in high-density bulk MgB 2 , prepared by the reactive liquid Mg infiltration technology. The intensity of the harmonic signal has been investigated as a function of temperature and amplitudes of the DC and microwave magnetic fields. The results are discussed in the framework of a phenomenological theory, based on the two-fluid model, which assumes that both the microwave and static magnetic fields, penetrating in the surface layers of the sample, weakly perturb the partial concentrations of the normal and superconducting fluids. We show that, in order to account for the experimental results, it is essential to suppose that in MgB 2 the densities of the normal and condensed fluids linearly depend on the temperature. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006

Keywords: 74.20.De Phenomenological theories (two-fluid, Ginzburg-Landau, etc.), 74.25.Nf Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.), 74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.) , (search for similar items in EconPapers)
Date: 2006
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DOI: 10.1140/epjb/e2006-00260-4

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