Measurement of the superconducting energy gap in La-Ba-Cu oxide and La-Sr-Cu oxide
P. E. Sulewski, A. J. Sievers, S. E. Russek, H. D. Hallen, D. K. Lathrop, R. A. Buhrman
DOI 10.1103/PhysRevB.35.5330 · Physical Review B
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Abstract
We report on far-infrared (FIR) reflectivity measurements on sintered pressed powder samples of La-Ba-Cu oxide and La-Sr-Cu oxide. The best samples show fairly sharp transitions to zero measurable resistance with a transition midpoint of 28 K for the Ba alloy and 36 K for the Sr alloy. The FIR measurements reveal an energy gap below Tc with, depending on the measurement criterion used, values of 2Δ/kBTc of 1.3–1.95 for La-Ba-Cu oxide and 1.6–2.7 for La-Sr-Cu oxide, which are lower than expected for a BCS superconductor.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La-Ba-Cuoxide Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28 | Pressure not reported | midpoint |
| La-Sr-Cuoxide 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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