Muon-spin-rotation measurements of the penetration depth in the YBa2Cu4O8 family of superconductors
A. Shengelaya, C. M. Aegerter, S. Romer, H. Keller, P. W. Klamut, R. Dybzinski, B. Dabrowski, I. M. Savić, J. Klamut
DOI 10.1103/PhysRevB.58.3457 · Physical Review B
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Abstract
We report muon-spin-rotation (μSR) measurements of the in-plane magnetic penetration depth (λab) in polycrystalline Ca- and La-doped YBa2Cu4O8 superconductors with Tc ranging from 72 to 88 K. In all samples the temperature dependence of the μSR depolarization rate σ(T)∝1/λab2(T) is linear below ∼25 K. This is similar to what was observed in recent μSR and surface impedance experiments on YBa2Cu3O7−δ single crystals. The low-temperature behavior of σ(T)/σ(0)=λab2(0)/λab2(T) shows practically no dependence on doping when plotted versus t=T/Tc. This observation puts important constraints on models proposed to explain the linear temperature dependence of λab in cuprate superconductors at low temperatures.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 81 | Pressure not reported | onset |
| Y0.94Ca0.06Ba2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 88 | Pressure not reported | onset |
| YBa1.925La0.075Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 74 | Pressure not reported | onset |
| YBa1.9La0.1Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 72 | Pressure not reported | onset |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Tl2Ba2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa1.85La0.15Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 63 | Pressure not reported | unknown |
| Y0.9Ca0.1Ba2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 87.5 | Pressure not reported | unknown |
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