Growth and conductivity of calcium cuprate films |
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| Authors: | G A Ovsyannikov S A Denisyuk I K Bdikin |
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| Affiliation: | 1.Institute of Radio Engineering and Electronics,Russian Academy of Sciences,Moscow,Russia;2.Institute of Solid State Physics,Russian Academy of Sciences,Chernogolovka, Moscow oblast,Russia;3.Chalmers University of Technology,G?teborg,Sweden |
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| Abstract: | Crystal and transport properties of epitaxial CaCuO2 (CCO) films are studied for samples grown on (110)NdGaO3, (001)SrTiO3, and (001)LaAlO3 substrates using the laser ablation technique. The resistivity is found to be dependent on the crystal quality of the films. The conductivity type varies depending on the doping. For lightly doped films with a resistance higher than 0.1 Ω cm, 3D hopping conductivity is observed. For low-resistance CCO films doped with Sr, a power law temperature dependence is found, which is inconsistent with the hopping conductivity. The influence of substrate tilting on the subsequent growth of CaCuO2 films is studied. YBCO/CCO heterostructures preserve high critical temperatures and small widths of superconducting transitions, which is of special importance for growing Josephson heterostructures for superconducting electronics. |
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