Anisotropic superconducting properties of YBa2Cu3O7−δ (δ=0.1 and 0.4) untwinned single crystals
W. Bauhofer, W. Biberacher, B. Gegenheimer, W. Joss, R. K. Kremer, Hj. Mattausch, A. Müller, A. Simon
DOI 10.1103/PhysRevLett.63.2520 · Physical Review Letters
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Abstract
We have performed a detailed anisotropy study of the superconducting properties of untwinned single crystals of YBa2Cu3O7−δ for δ≊0.1 and δ≊0.4 in magnetic fields up to 22 T using a rf method giving critical fields H* which are determined by the onset of flux-line motion. For δ≊0.1 we find the highest H* along the b axis; the a-b anisotropy amounts to 20% at 85 K. The 60-K superconductivity for δ≊0.4 is characterized by the largest H* along the a axis and pronounced 2D behavior as manifested by a cusp in the angular dependence of H* and by the extremely steep slope of H*(T) perpendicular to c. We discuss our experimental results with respect to the significance of the Cu-O chains for the high-Tc superconductivity of YBa2Cu3O7−δ.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O6.9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91.5 | Pressure not reported | onset |
| YBa2Cu3O6.6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 60 | Pressure not reported | onset |
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