Phase-sensitive evidence for dx2−y2-pairing symmetry in the parent-structure high-Tc cuprate superconductor Sr1−xLaxCuO2
Jochen Tomaschko, Sebastian Scharinger, Victor Leca, Joachim Nagel, Matthias Kemmler, Teresa Selistrovski, Dieter Koelle, Reinhold Kleiner
DOI 10.1103/PhysRevB.86.094509 · Physical Review B
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Abstract
We report on a phase sensitive study of the superconducting order parameter of the infinite layer cuprate Sr1−xLaxCuO2 (SLCO), with x≈0.15. For the study a SLCO thin film was grown epitaxially on a tetracrystal substrate and patterned into direct-current superconducting quantum interference devices (dc SQUIDs). The geometry was designed to be frustrated for dx2−y2-wave pairing, that is, the SQUID ring comprising the tetracrystal point contains one 0 Josephson junction and one π Josephson junction, if the order parameter has dx2−y2-wave symmetry. Our results show that SLCO indeed is a dx2−y2-wave superconductor. This symmetry thus seems to be inherent to cuprate superconductivity. Subdominant order parameter components can be ruled out at least on a 5% level and may not be a necessary ingredient of high-Tc superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr1-xLaxCuO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18 | Pressure not reported | onset |
| Sr1-xLaxCuO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 43 | Pressure not reported | unknown |
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