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 T-c, it 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 file temperature dependence of the harmonic signal. (

AGLIOLO GALLITTO A, BONSIGNORE G, LI VIGNI M (2005). Microwave second-harmonic response of ceramic MgB2 samples. PHYSICA. C, SUPERCONDUCTIVITY, 432(3-4), 306-314 [10.1016/j.physc.2005.09.007].

Microwave second-harmonic response of ceramic MgB2 samples

AGLIOLO GALLITTO, Aurelio;BONSIGNORE, Gaetano;LI VIGNI, Maria
2005-01-01

Abstract

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 T-c, it 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 file temperature dependence of the harmonic signal. (
2005
AGLIOLO GALLITTO A, BONSIGNORE G, LI VIGNI M (2005). Microwave second-harmonic response of ceramic MgB2 samples. PHYSICA. C, SUPERCONDUCTIVITY, 432(3-4), 306-314 [10.1016/j.physc.2005.09.007].
File in questo prodotto:
File Dimensione Formato  
1-s2.0-S0921453405007203-main.pdf

Solo gestori archvio

Dimensione 512.86 kB
Formato Adobe PDF
512.86 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/25378
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 3
  • ???jsp.display-item.citation.isi??? 4
social impact