Determination of the upper critical field of the electron-doped superconductor Sm1.85Ce0.15CuO4−y from resistive fluctuations
S. H. Han, C. C. Almasan, M. C. de Andrade, Y. Dalichaouch, M. B. Maple
DOI 10.1103/PhysRevB.46.14290 · Physical Review B
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Abstract
The upper critical field Hc2(T) for the magnetic field applied parallel to the c axis of a Sm1.85Ce0.15CuO4−y single crystal has been determined from an analysis of magnetoresistance data in terms of the Ginzburg-Landau fluctuation theory for layered superconductors. The fluctuations are predominantly two dimensions (2D) away from Tc(H) with a crossover to 3D as Tc(H) is approached. The Hc2(T) curve shows negative curvature and is in excellent agreement with the Werthamer, Helfand, Hohenberg, and Maki theory for conventional superconductors without paramagnetic limiting effects. The values of the initial slope (dHc2/dT)Tc=-7.38 kOe/K, coherence length ξ(0)=48.4 Å, and orbital critical field Hc2(0)=97.6 kOe, derived from this analysis, are in good agreement with the values we previously obtained from fits of the Hao-Clem variational model to reversible magnetization data below Tc.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sm1.85Ce0.15CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 19.1 | Pressure not reported | onset |
| Sm1.85Ce0.15CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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