Evidence of d{sub x}{sup 2}{sub -y}{sup 2} symmetry in the tunneling density of states of Tl{sub 2}Ba{sub 2}CuO{sub 6}.
Tunnel junctions have been made on single crystals of Tl{sub 2}Ba{sub 2}CuO{sub 6} with a {Tc}{approx}91 K using a mechanical point-contact method. Both superconductor-insulator-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}{sub -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.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- ER
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 937972
- Report Number(s):
- ANL/MSD/JA-25055
- Journal Information:
- Phys. Rev. B, Journal Name: Phys. Rev. B Journal Issue: 6 ; Feb. 1, 1998 Vol. 57; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- ENGLISH
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