Significant reduction of the microwave surface resistance of MgB2 films by surface ion milling
Significant reduction of the microwave surface resistance of MgB2 films by surface ion milling
The microwave surface resistance RS of MgB2 films with the zero-resistance temperature of ∼39 K was measured at 8.0–8.5 GHz. The MgB2 films were prepared by deposition of boron films on c-cut sapphire, followed by annealing in a magnesium vapor environment. The RS appeared significantly reduced by ion milling of …