Paper  Title  Page 

TUOFDV01 
Dynamic Penetration Field of Vortices in a Superconductor Under RF Magnetic Field  


Funding: This work was supported by DOE under grant No. DESC0010081. We address the nonlinear dynamics of penetration of vortices in a superconductor subject to a periodic magnetic field H(t)=H_{0}\sinω t parallel to the surface. The timedependent GinzburgLandau equations for a gapped superconductor were simulated numerically to calculate the frequency and temperature dependencies of the field onset H_{p}(T,ω) of vortex penetration at T≈ T_{c}. It is shown that H_{p}(T,ω) can exceed the dc superheating field H_{s} at which the Meissner state becomes unstable. Here H_{p}(T,ω) increases with ω and approaches √{2}H_{s}(T) at ωτ≥ 1, where τ(T) is the energy relaxation time of quasiparticles on phonons. We also investigated the effect of surface topographic defects on H_{p}(T,ω) and showed that they can substantially reduce H_{p}(T,ω) and cause additional power dissipation. Ultimately, we draw conclusions by comparing the results of our calculations with recent experimental measurements. 

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