c-Axis Twist Bi2Sr2CaCu2O(8+delta) Josephson Junctions: A New Phase-Sensitive Test of Order Parmaeter Symmetry

Details c-Axis Twist Bi2Sr2CaCu2O(8+delta) Josephson Junctions: A New Phase-Sensitive Test of Order Parmaeter Symmetry c-Axis Twist Bi2Sr2CaCu2O(8+delta) Josephson Junctions: A New Phase-Sensitive Test of Order Parmaeter Symmetry

1999-02-19

arxiv.org/abs/cond-mat/9902271v1

Physics

Condensed Matter

Superconductivity

3 pages, 4 figures, Invited talk to be published in AIP Proceedings of the University of Miami Conference on High Temperature

Scientific paper

Li et al. found that the critical current density JcJ across atomically clean c-axis twist junctions of Bi2Sr2CaCu2O(8+x) is the same as that of the constituent single crystal, JcS, independent of the twist angle phi0, even at Tc. We investigated theoretically if a dx2-y2-wave order parameter might twist by mixing in dxy components, but find that such twisting cannot possibly explain the data near to Tc. Hence, the order parameter contains an s-wave component, but not any dx2-y2-wave component. In addition, the c-axis Josephson tunneling is completely incoherent. We also propose a c-axis junction tricrystal experiment which does not rely upon expensive substrates.

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