Abstract
High Tc superconducting artificial lattices have been constructed by a layer-by-layer laser molecular beam epitaxy method with atomic layer and sub-unit cell accuracy, and the basic structural factors in the high Tc cuprates have been controlled artificially. In the Bi 2Sr 2Ca n−1Cu nO 2n+4 artificial lattices, the numbers of CuO 2 planes are changed from one to even eight in the unit formula. The compression and expansion of the CuO 2 plane are demonstrated in the strained superlattices of YBa 2Cu 3O 7/(La,Sr) 2CuO 4 and (La,Sr) 2CuO 4/Sm 2CuO 4. In these superlattices, the change of the lattice constant along a,b axes is proved to be one of the important controlling factors in the high Tc cuprates. This technique has been also applied to obtain reliable tunneling spectra of Au/Bi 2Sr 2CiO 6/Bi 2Sr 2CaCu 2O 8, and reproducible BCS-like spectra have been obtained in this system. The results indicate that the high Tc cuprate is essentially the BCS superconductor.
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