Tunneling spectroscopy of Tl{sub 2}Ba{sub 2}CuO{sub 6}.
New results from tunneling spectroscopies on near optimally doped single crystals of Tl{sub 2}Ba{sub 2}CuO{sub 6} (Tl-2201) junctions are presented. The superconductor-insulator-normal metal (SIN) tunnel junctions are obtained using the point-contact technique with a Au tip. The tunneling conductances reproducibly show a sharp cusp-like subgap, prominent quasiparticle peaks with a consistent asymmetry, and weakly decreasing backgrounds. A rigorous analysis of the SIN tunneling data is performed using two different models for the d{sub x{sup 2}-y{sup 2}} (d-wave) density of states (DOS). Based on these and earlier results, the tunneling DOS of Tl-2201 has exhibited the most reproducible data that are consistent with a d-wave gap symmetry. We show that the dip feature at 2{Delta} that is clearly seen in SIN tunneling data of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} is also present in Tl-2201, but at a weaker level. The gap values for crystals with a bulk T{sub c}=86 K are in the range of 19-25 meV.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC; NSF
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 942534
- Report Number(s):
- ANL/MSD/JA-32320
- Journal Information:
- Physica C, Journal Name: Physica C Journal Issue: 1999 Vol. 320; ISSN 0921-4534; ISSN PHYCE6
- Country of Publication:
- United States
- Language:
- ENGLISH
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