Microwave measurements of the high magnetic field vortex motion pinning parameters in Nb${}_3$Sn

Abstract

The high frequency vortex motion in Nb${}_3$Sn was analyzed in this work up to 12 T. We used a dielectric loaded resonator tuned at 15 GHz to evaluate the surface impedance $Z$ of a Nb${}_3$Sn bulk sample (24.8 at.\%Sn). From the field induced variation of $Z$, the high frequency vortex parameters (the pinning constant $k_p$, the depinning frequency ${\nu }_p$ and the flux flow resistivity ${\rho }_{ff}$) were obtained over a large temperature and field range; their field and temperature dependence were analyzed. Comparison with other superconducting materials shows that high frequency applications in strong magnetic fields are also feasible with Nb${}_3$Sn. In the present work, we report the first measurements about the microwave response in Nb${}_3$Sn in strong magnetic fields.

24 pages, 12 figures

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• Pinning, flux flow resistivity and anisotropy of Fe(Se,Te) thin films from microwave measurements through a bitonal dielectric resonator
• Microwave Microscope Studies of Trapped Vortex Dynamics in Superconductors
• Low frequency electrodynamics in the mixed state of superconducting NbN and a-MoGe films using two-coil mutual inductance technique
• Ac losses in field-cooled type I superconducting cavities
• Quantifying Trapped Magnetic Vortex Losses in Niobium Resonators at mK Temperatures
• Quantum Mechanics of an Abrikosov Vortex in Nanofabricated Pinning Potential
• Microscopic Investigation of rf Vortex Nucleation in Nb3Sn Films Using a Near-Field Magnetic Microwave Microscope
• Microwave Vortex Motion Characterization of Nb${}_3$Sn Coatings for Applications in High Magnetic Fields