Testing models of the symmetry of the superconducting pairing state by low-temperature electron irradiation of an untwinned single crystal of YBa2Cu3O7−δ
J. Giapintzakis, D. M. Ginsberg, M. A. Kirk, S. Ockers
DOI 10.1103/PhysRevB.50.15967 · Physical Review B
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Abstract
We have carried out in situ resistivity measurements in a high-voltage electron microscope to determine how the superconducting transition temperature Tc and the resistivity ρ(T) change with low-temperature electron irradiation. We find that point defects introduced by oxygen displacements from the CuO2 planes make the dominant contribution to the irradiation-induced suppression of Tc. We find that dTc/dρ is ∼-0.30±0.04 K/μΩ cm. Analysis of this result indicates the effect of strongly anisotropic superconductivity, and rules out isotropic s-wave pairing. Even though our data cannot determine whether the pairing symmetry is s or d wave, they provide a test for further theoretical developments.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90.5 | Pressure not reported | onset |
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