Abstract
We report the first tunneling measurements made on the new high-transition-temperature perovskite superconductors. These were obtained using an ultrahigh-vacuum low-temperature scanning-tunneling microscope. The superconducting gap of a La1.85Sr0.15CuO4-y sample is 123 mV, and the onset Tc is 40 K, from which 2/kBTc=72. The possibility that this surprisingly high ratio may be due to a mechanism other than superconductivity is discussed.
Original language | English |
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Pages (from-to) | 7220-7223 |
Number of pages | 4 |
Journal | Physical Review B |
Volume | 35 |
Issue number | 13 |
DOIs | |
State | Published - 1987 |
ASJC Scopus subject areas
- Condensed Matter Physics