Evidence of nodal gap structure in the basal plane of the FeSe superconductor
Pabitra K. Biswas, Andreas Kreisel, Qisi Wang, Devashibhai T. Adroja, Adrian D. Hillier, Jun Zhao, Rustem Khasanov, Jean-Christophe Orain, Alex Amato, Elvezio Morenzoni
DOI 10.1103/PhysRevB.98.180501 · Physical Review B
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Abstract
Identifying the symmetry of the wave function describing the Cooper pairs is pivotal in understanding the origin of high-temperature superconductivity in iron-based superconductors. Despite nearly a decade of intense investigation, the answer to this question remains elusive. Here, we use the muon spin rotation/relaxation (μSR) technique to investigate the underlying symmetry of the pairing state of the FeSe superconductor, the basic building block of all iron-chalcogenide superconductors. Contrary to earlier μSR studies on powders and crystals, we show that while the superconducting gap is most probably anisotropic but nodeless along the crystallographic c axis, it is nodal in the ab plane, as indicated by the linear increase of the superfluid density at low temperature. We further show that the superconducting properties of FeSe display a less pronounced anisotropy than expected.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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