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

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

Risultato della ricerca: Article

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

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Surface resistance
Cavity resonators
cavity resonators
Microwaves
microwaves
curves
rods
conductors
cavities
infiltration
Temperature
temperature
tubes
temperature dependence
Infiltration
liquids
Liquids

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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Frequency dependence of the microwave surface resistance of MgB2 by coaxial cavity resonator. / Li Vigni, Maria; Agliolo Gallitto, Aurelio; Giunchi; Figini Albisetti; Camarda, Pietro.

In: PHYSICA. C, SUPERCONDUCTIVITY, Vol. 503, 2014, pag. 150-153.

Risultato della ricerca: Article

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title = "Frequency dependence of the microwave surface resistance of MgB2 by coaxial cavity resonator",
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.",
author = "{Li Vigni}, Maria and {Agliolo Gallitto}, Aurelio and Giunchi and {Figini Albisetti} and Pietro Camarda",
year = "2014",
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journal = "Physica C: Superconductivity and its Applications",
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T1 - Frequency dependence of the microwave surface resistance of MgB2 by coaxial cavity resonator

AU - Li Vigni, Maria

AU - Agliolo Gallitto, Aurelio

AU - Giunchi, null

AU - Figini Albisetti, null

AU - Camarda, Pietro

PY - 2014

Y1 - 2014

N2 - 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.

AB - 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.

UR - http://hdl.handle.net/10447/95789

UR - http://www.sciencedirect.com/science/article/pii/S0921453414001063

M3 - Article

VL - 503

SP - 150

EP - 153

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

SN - 0921-4534

ER -