## Symmetry of the Superconducting Order-Parameter in Bi2sr2cacu2ox

We analyzed the symmetry of the superconducting-phase condensate of Bi2Sr2CaCu2Ox with photoemission at high energy and angular resolution. The result unambiguously demonstrates that the photohole must include non-s-wave components. Under the hypothesis of a pure d-wave symmetry, this would be identified as d(xz) + d(yz). Our superconducting state data are, specifically, incompatible with pure d(x2-y2) symmetry. Mixed symmetries, however, cannot be excluded as long as they include a non-s-wave component. We specifically observe a change in the symmetry of electronic states between the normal state and the superconducting state.

Published in:
Physical Review Letters, 71, 24, 4051-4054
Year:
1993
ISSN:
0031-9007
Keywords:
Note:
Ecole polytech fed lausanne,inst phys appl,ch-1007 lausanne,switzerland. Kelley, rj, univ wisconsin,dept phys,madison,wi 53706.
ISI Document Delivery No.: ML868
Laboratories: