Abstract
We grew single-crystalline Sr 1− x La x CuO 2 thin films of electron-doped infinite-layer compounds by molecular beam epitaxy. Crucial to our success was the use of KTaO 3 substrates. The best film showed T c onset=41.5 K and T c zero=39.0 K. The resistivity of the optimum-doped films exhibited metallic temperature dependence with a low resistivity of 320 μΩ cm at room temperature and 120 μΩ cm just above T c. Such excellent electrical properties have not previously been reported for this system with either thin films or bulk polycrystalline specimens.
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