Evidence of d{sub x{sup 2}{minus}y{sup 2}} symmetry in the tunneling conductance density of states of Tl{sub 2}Ba{sub 2}CuO{sub 6}
- Illinois Institute of Technology, Chicago, Illinois 60616 (United States)
- Science and Technology Center for Superconductivity, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
Tunnel junctions have been made on single crystals of Tl{sub 2}Ba{sub 2}CuO{sub 6} with a T{sub c}{approximately}91 K using a mechanical point-contact method. Both superconductor{endash}insulator{endash}normal-metal (SIN) and superconductor-insulator-superconductor (SIS) junctions were obtained using Au and Nb tips, respectively. The tunneling conductances obtained are reproducible, with sharp, well-defined energy gap structures and are characterized by a cusplike feature at zero bias. These conductances can be fit to a simple, momentum-averaged density of states (DOS) obtained from a superconducting order parameter with d{sub x{sup 2}{minus}y{sup 2}} symmetry. The SIS data display a weak Nb gap feature which is consistent with the subgap DOS observed in the SIN data. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 573988
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 6 Vol. 57; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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