Anisotropic superconducting properties of Ba2YCu3O7−y
M. Oda, Y. Hidaka, M. Suzuki, T. Murakami
DOI 10.1103/PhysRevB.38.252 · Physical Review B
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Abstract
The upper critical magnetic field Hc2 of Ba2YCu3O7−y single crystals is estimated from the resistive transition curves as a function of temperature and field direction. Hc2 exhibits a large anisotropy between the c axis and the a−b plane. The Hc2 data have linear temperature dependence, giving well-defined dHc2dT values: -0.56 T/K for the c axis and -3.3 T/K for the a−b plane. The angular dependence of Hc2 is in good agreement with the effective-mass model when the ratio M⊥M∥=60, which is comparable to resistivity anisotropy in the normal state. On the other hand, no signs of anisotropy in the a−b plane can be recognized. This indicates that supercurrent flows dominantly in the Cu-O sheets, and that the Cu-O chains with oxygen deficiency are less conductive.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba2YCu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | Pressure unresolved | onset |
| Ba2YCu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure unresolved | zero_resistance |
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