TUNNEL SPECTROSCOPY INTO THE YBA2CU4O8 COMPOUND

Conference item

We have realized planar tunnel junctions using both Y123 and Y124 single crystals as base electrodes and Pb as counterelectrode. The crystals, with Tc=90 K (Y123) and Tc=80 K (Y124), have been chemically etched and natural barriers were formed by a short air exposure. We have compared the tunneling spectra obtained on both systems. The features at about±18mV of the Y123 compound are still observed in the Y124, while the low-bias structures at ±5 mV are not present in the tunneling characteristics of the Y124 system. Linearity of the background conductance is also observed, with less steep slopes in Y124 that might indicate a reduced interlayer coupling in this system. © 1994 Società Italiana di Fisica.

Authors: Romano, P; Dileo, R; Nigro, A; Cucolo, A; Dabrowski, B

• Publication status: Published
• Host title: NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA D-CONDENSED MATTER ATOMIC MOLECULAR AND CHEMICAL PHYSICS FLUIDS PLASMAS BIOPHYSICS
• Volume: 16
• Issue: 10-11
• Pages: 1885-1888
• Publication date: 1994-01-01
• DOI: 10.1007/BF02462189
• EISSN: 1826-9893
• ISSN: 0392-6737