Dependences of Microwave Surface Resistance of YBCO Thin Films With and Without Doped APCs

–Reducing Microwave Surface Resistance in a DC Magnetic Field by Introducing APCs–

Abstract

We investigated the effect of introducing artificial pinning centers (APCs) into YBCO thin films to reduce the R_s in a high magnetic field. YBCO thin films with and without APCs were deposited on MgO(100) substrates by using the pulsed laser deposition (PLD) technique. We used BaMO₃ (BMO, M = Zr, Hf) doped YBCO targets. The R_s of thin films was measured at 21.8 GHz with the dielectric resonator method and a DC magnetic field of up to 5.0 T. The R_s values of 1.5 wt. % of the BHO doped films were approximately 1/2 compared with that of the R_s of the pure YBCO films. As a result, YBCO thin films with APCs could provide advantages for NMR application.