Reduction of microwave loss by mobile fluxons in grooved Nb films
arXiv:1805.10882 · doi:10.1002/pssr.201800223
Abstract
In the mixed state of type II superconductors penetrated by an external magnetic field in the form of a lattice of Abrikosov vortices the dc resistance is known to increase with increasing velocity of the vortex lattice. Accordingly, vortex pinning sites impeding the vortex motion are widely used to preserve the low-dissipative response of the system. Here, while subjecting superconducting Nb films with nanogrooves to a combination of dc and ac current stimuli and tuning the number of mobile and pinned vortices by varying the magnetic field around the so-called matching values, we observe a completely opposite effect. Namely, the vortex-related microwave excess loss for mobile vortices becomes smaller than for pinned vortices in a certain range of power levels at ac current frequencies above 100\,MHz. While a theoretical description of the observed effect is yet to be elaborated we interpret our findings in terms of a competition of the effective cooling of the system by the quasiparticles leaving the vortex cores with the conventional Joule heating caused by the current flow.
arXiv comment5 pages, 3 figures
References in corpus (17)
- Circuit Quantum Electrodynamics: Coherent Coupling of a Single Photon to a Cooper Pair Box
- Detecting Single Infrared Photons with 93% System Efficiency
- Demonstration of Two-Qubit Algorithms with a Superconducting Quantum Processor
- Focused electron beam induced deposition meets materials science
- Evidence of a nonequilibrium distribution of quasiparticles in the microwave response of a superconducting aluminium resonator
- Reliable determination of vortex parameters from measurements of the microwave complex resistivity
- Microwave response of thin niobium films under perpendicular static magnetic fields
- Abrikosov fluxonics in washboard nanolandscapes
- Dual cut-off dc-tunable microwave low-pass filter on superconducting Nb microstrips with asymmetric nanogrooves
- AC-driven microwave loss modulation in a fluxonic metamaterial
- Frequency-dependent ratchet effect in superconducting films with a tilted washboard pinning potential
- Superconducting nanowires by electron-beam-induced deposition
- Radiofrequency generation by coherently moving fluxons
- Superconductivity in the presence of microwaves: Full phase diagram
- Time dependent London approach, dissipation due to out-of-core normal excitations by moving vortices
- dc and ac magnetic properties of thin-walled Nb cylinders with and without a row of antidots
- Characterising superconducting filters using residual microwave background
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