Single-crystalline superconducting thin films of electron-doped infinite-layer compounds grown by molecular-beam epitaxy

Single-crystalline Sr1-xLaxCuO2 thin films of electron-doped infinite-layer compounds were grown by molecular-beam epitaxy. Crucial to our success was the use of KTaO3 substrates. The best film showed T-c(onset)=41.5 K and T- c(zero)=39.0 K, which is close to the highest T-c(onset) of 43 K for the bu lk value. The resistivity of the optimum-doped film exhibited metallic temp erature dependence with a low resistivity of 320 mu Omega cm at room temper ature and 120 mu Omega cm just above T-c. (C) 2001 American Institute of Ph ysics.