CHARACTERIZATION OF BA1-XKXBIO3 SUPERCONDUCTING THIN-FILMS FOR 3-TERMINAL DEVICES

The physical parameters of a Ba-1-xKxBiO3 (BKBO) superconductor have b een successfully estimated by measuring the Hall effect and optical re flectivity spectra for epitaxial thin films. The results of these meas urements at room temperature indicated that the optimized BKBO thin fi lm has a carrier density of 5.0 x 10(21) cm(-3) and an effective mass of 0.9m(0). Supposing the free-electron model, Fermi energy of BKBO co uld be estimated to be 1.2 eV. Using these parameters, the quasi-parti cle transmission probability was also calculated for the BKBO/Nb-doped SrTiO3 junction.