Quasiparticle tunneling spectroscopy of high {Tc} cuprates
- Illinois Inst. of Tech., Chicago, IL (United States)
- Argonne National Lab., IL (United States). Materials Science Div.
- Univ. of Texas, Austin, TX (United States)
Superconductor-insulator-normal metal (SIN) and superconductor-insulator-superconductor (SIS) tunnel junctions provide important information on pairing state symmetry and mechanism. Measurements of such junctions on high {Tc} superconductors (HTS) are reported using mechanical point contacts, which generally display the optimum characteristics that can be obtained from HTS native-surface tunnel barriers. New tunneling data on the infinite-layer cuprate, Sr{sub 1{minus}x}Nd{sub x}CuO{sub 2} are reported which show a remarkable similarity to another electron-doped cuprate, Nd{sub 1.85}Ce{sub 0.85}CuO{sub 4}. In particular, there is a strong, asymmetric linear background conductance that is indicative of inelastic tunneling from a continuum of states. A discussion is given of the anomalous dip feature found in the tunneling and photoemission data on BSCCO 2212. It is shown that a similar feature is found in many cuprate junctions and that this dip scales with the gap energy over a wide range. New data on the single-layer, tetragonal cuprate, Tl{sub 2}Ba{sub 2}CuO{sub 6} (Tl2201) are presented and discussed in light of recent published results on the similar compound HgBa{sub 2}CuO{sub 4} (Hg1201). The HG1201 data display a low, flat sub-gap tunneling conductance which is consistent with a BCS density of states whereas the T12201 data display a cusp-like feature at zero bias which is more consistent with d{sub x}2-{sub y}2 symmetry.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 226043
- Report Number(s):
- ANL/MSD/CP-89607; CONF-960163-22; ON: DE96009125; BR: ?; CNN: Contract DMR91-20000; TRN: AHC29610%%85
- Resource Relation:
- Conference: Photonics West `96: conference on quantum well and superlattice physics VI, San Jose, CA (United States), 27 Jan - 2 Feb 1996; Other Information: PBD: [1996]
- Country of Publication:
- United States
- Language:
- English
Similar Records
Tunneling spectra and superconducting gap in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+delta} and Tl{sub 2}Ba{sub 2}CuO{sub 6+delta}.
Tunneling spectra and superconducting gap in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} and Tl{sub 2}Ba{sub 2}CuO{sub 6+{delta}}