Measurements of the superconducting gap of La-Sr-Cu-O with a scanning-tunneling microscope
S. Pan, K. W. Ng, A. L. de Lozanne, J. M. Tarascon, L. H. Greene
DOI 10.1103/PhysRevB.35.7220 · Physical Review B
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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 12±3 mV, and the onset Tc is 40 K, from which 2Δ/kBTc=7±2. The possibility that this surprisingly high ratio may be due to a mechanism other than superconductivity is discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.85Sr0.15CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | onset |
| La1.85Sr0.15CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38.5 | Pressure not reported | midpoint |
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