Frequency dependence of the microwave surface resistance of MgB2 by coaxial cavity resonator

Aurelio Agliolo Gallitto, Maria Li Vigni, Giunchi, Figini Albisetti, Pietro Camarda

Risultato della ricerca: Articlepeer review

Abstract

We report on the microwave (mw) properties of a cylindrical MgB2 rod prepared by the reactive liquid Mg infiltration technology. The MgB2 rod, 94.3 mm long, is used as inner conductor of a coaxial cavity having a Cu tube as external conductor. By analyzing the resonance curves of the cavity in the different resonant modes and at different temperatures, we have determined the temperature dependence of the mw surface resistance, Rs, of the MgB2 material, at fixed frequencies, and the frequency dependence of Rs, at fixed temperatures. Our results show that the Rs(f) curves follow a f^n law, where n decreases on increasing the temperature, starting from n=2, at T=4.2 K, down to n=0.7 at T>Tc. The double gap nature of MgB2 manifests itself in the presence of a wide low-T tail in the R(T) curves, which can be ascribed to the quasiparticles thermally excited through the pi gap even at relatively low temperatures.
Lingua originaleEnglish
pagine (da-a)150-153
Numero di pagine4
RivistaPHYSICA. C, SUPERCONDUCTIVITY
Volume503
Stato di pubblicazionePublished - 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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