Infrared observation of two-fluid superconductivity in YBa2Cu3O7−x
D. van der Marel, M. Bauer, E. H. Brandt, H.-U. Habermeier, D. Heitmann, W. König, A. Wittlin
DOI 10.1103/PhysRevB.43.8606 · Physical Review B
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Abstract
We observe critical behavior near Tc in the infrared reflectivity of c-axis-oriented YBa2Cu3O7−x films prepared with pulsed in situ laser deposition. From comparison with theoretical spectra we show that the observed behavior is in excellent agreement with a phenomenological two-fluid model and in strong disagreement with standard BCS theory. We demonstrate that the superconducting charge carrier density is the relevant order parameter with a temperature-independent in-plane gap parameter.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 89 | Pressure not reported | midpoint |
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 89 | Pressure not reported | midpoint |
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