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Title: Tunneling spectroscopy of Tl2Ba2CuO6
Authors: Özyüzer, Lütfi
Yusof, Zikri
Zasadzinski, John F.
Li, Ting-Wei
Hinks, David G.
Gray, Kenneth E.
Özyüzer, Lütfi
Izmir Institute of Technology. Physics
Keywords: Thallium compounds
Electron tunneling
Electronic density of states
Energy gap
High-temperature superconductivity
Tunneling spectroscopy
Superconducting gap
Issue Date: Jul-1999
Publisher: Elsevier Ltd.
Source: Özyüzer, L., Yusof, Z., Zasadzinski, J. F., Li, T.-W., Hinks, D. G., and Gray, K. E. (1999). Tunneling spectroscopy of Tl2Ba2CuO6. Physica C: Superconductivity and its Applications, 320(1), 9-20. doi:10.1016/S0921-4534(99)00324-X
Abstract: New results from tunneling spectroscopies on near optimally doped single crystals of Tl2Ba2CuO6 (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 dx(2)-y(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 Δ that is, clearly seen in SIN tunneling data of Bi2Sr2CaCu2O8+δ is also present in Tl-2201, but at a weaker level. The gap values for crystals with a bulk Tc = 86 K are in the range of 19-25 meV.
ISSN: 0921-4534
Appears in Collections:Physics / Fizik
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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