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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Zasadzinski, J.F. Tralshawala, N. Huang, Q. Gray, K.E. Hinks, D.G. |
| Copyright Year | 1965 |
| Abstract | Tunneling measurements are reported for ND/sub 1.85/Ce/sub 0.15/CuO/sub 4-y/ (NCCO) and Ba/sub 1-x/K/sub x/BiO/sub 3/ (BKBO) using the point-contact technique with an Au or Nb tip. The junctions display very low zero-bias conductance values of <1% for BKBO and approximately 10% for NCCO and show sharp conductance peaks at eV=+or- Delta . In the case of BKBO, the normalized conductance can be fit with a BCS (Bardeen-Cooper-Schrieffer) density of states with thermal smearing only. The energy gaps are in good agreement with optical measurements and lead to values of 2 Delta /kT/sub c/ in the range of 3.5-4.0 for both compounds, implying moderate coupling strength. The tunneling conductance data at high bias voltages display reproducible structures which are characteristic of phonon effects as found in conventional superconductors. The Eliashberg functions were obtained, and the resulting values of lambda determined from this analysis are consistent with the measured values of the strong-coupling ratio, 2 Delta /kT/sub c/. It is concluded that the pairing mechanism in both materials is principally phonon mediated. |
| Sponsorship | IEEE Magnetics Society |
| Starting Page | 833 |
| Ending Page | 836 |
| Page Count | 4 |
| File Size | 396847 |
| File Format | |
| ISSN | 00189464 |
| Volume Number | 27 |
| Issue Number | 2 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1991-03-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Tunneling Spectroscopy Neodymium Displays Phonons Gold Niobium Thermal conductivity Biomedical optical imaging Energy measurement |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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