{ital ab}-Plane Anisotropy of Transport Properties in Unidirectionally Twinned YBa{sub 2}Cu{sub 3}O{sub {bold 7{minus}{delta}}} Films
- EPM-MATFORMAG, Centre National de la Recherche Scientifique, BP 166, 38042 Grenoble Cedex 9 (France)
- Laboratoire de Cristallographie, CNRS, BP 166, 38042 Grenoble Cedex 9 (France)
- Laboratoire d`Etudes des Proprietes Electronique des Solides, CNRS, BP 166, 38042 Grenoble Cedex 9 (France)
- Physics Department and the Crown Center for Superconductivity, Technion-Israel Institute of Technology, Haifa 32000 (Israel)
A unidirectionally twinned, {ital c} oriented YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} film was prepared on a (001) NdGaO{sub 3} substrate. In the normal state between 100 and 300K, the unidirectional twin plane lattice induces a strong anisotropy of {rho}{sub {ital ab}}, leading to a temperature independent ratio of 6 between the resisitivities across and along the twin boundaries. At 77K, the self-field critical current parallel to twin planes is 1.2{times}10{sup 6} A/cm{sup 2}, a value which is 25 times higher than along the perpendicular direction. This shows that, at this temperature, twin boundaries control the critical current values in YBCO films by either channeling or pinning effects. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 389381
- Journal Information:
- Physical Review Letters, Vol. 77, Issue 18; Other Information: PBD: Oct 1996
- Country of Publication:
- United States
- Language:
- English
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