Magnetic hysteresis effects in superconducting coplanar microwave resonators
Magnetic hysteresis effects in superconducting coplanar microwave resonators
We performed transmission spectroscopy experiments on coplanar half wavelength niobium resonators at a temperature T=4.2 K. We observe not only a strong dependence of the quality factor Q and the resonance frequency f_res on an externally applied magnetic field but also on the magnetic history of our resonators, i.e. on …