Local tunneling measurements of the high-Tc superconductor La2−xSrxCuO4−y
J. R. Kirtley, C. C. Tsuei, Sung I. Park, C. C. Chi, J. Rozen, M. W. Shafer
DOI 10.1103/PhysRevB.35.7216 · Physical Review B
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Abstract
We have measured the current-voltage (I-V) characteristics for tunneling into the superconducting layered copper oxide La2−xSrxCuO4−y using a low-temperature scanning-tunneling microscope. The I-V curves were highly nonlinear, even at low voltages, with evidence for superconducting energy gaps Δ of several meV. Substantial variation of Δ was observed from measurement to measurement, with the largest being Δ∼7 meV, corresponding to 2Δ/kBTc∼4.5. .AE
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xSrxCuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 36 | Pressure not reported | midpoint |
| La1.8Sr0.2CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | onset |
| La1.8Sr0.2CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 33 | Pressure not reported | zero_resistance |
| La1.85Sr0.15CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 36 | Pressure not reported | midpoint |
| La1.85Sr0.15CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 36 | Pressure not reported | midpoint |
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