Crystal structure and superconductivity of (La,Sr) sub 2 CuO sub 4 /Sm sub 2 CuO sub 4 superlattices prepared by excimer laser deposition
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567, Japan (JP)
We have grown superlattices of (La,Sr){sub 2}CuO{sub 4}/Sm{sub 2}CuO{sub 4} (1/1 to 120/120) onto SrTiO{sub 3} substrates by an excimer laser deposition technique. These superlattices can be classified into three regions. For the short periodicity of the stacking up to 4/4, new structures are constructed having a large unit cell made of a CuO{sub 5} pyramid, CuO{sub 6} octahedral, and CuO{sub 4} sheet. For the large periodicity more than 60/60, the superlattices exhibit the same superconducting behavior as the standard (La,Sr){sub 2}CuO{sub 4}. The superlattices of the intermediate periodicity, from 60/60 to 15/15 on the other hand, show changes in the critical temperature as the variation of the stacking periodicity. This phenomenon is explained to be derived from a pressure effect caused by a lattice mismatch between (La,Sr){sub 2}CuO{sub 4} and Sm{sub 2}CuO{sub 4} layers.
- OSTI ID:
- 5735801
- Journal Information:
- Applied Physics Letters; (USA), Vol. 58:13; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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