Observation of quasiparticle Andreev bound states using YBa2Cu3O7−y/Ag ramp-edge junctions with different interface geometries
Wan Wang, Masashi Yamazaki, Kiejin Lee, Ienari Iguchi
DOI 10.1103/PhysRevB.60.4272 · Physical Review B
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Abstract
We present measurements on quasiparticle tunneling using YBa2Cu3O7−y (YBCO)/Ag ramp-edge junctions. The tunnel direction was toward the CuO2 planes. Two junctions with different tilted angles between the a axis of YBCO and the junction boundary were fabricated on the same substrate simultaneously. For the junctions with the tilted angle of 45°, the zero-bias conductance peak (ZBCP) was observed. On the contrary, for those fabricated with the tilted angle of 0°, a dip structure around zero bias was mostly observed. The results are consistent with the recent studies on the Andreev reflection between a dx2−y2-wave superconductor and a normal metal. The dependencies of ZBCP on temperature and magnetic field are also presented.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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