Journal
PHYSICAL REVIEW B
Volume 98, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.98.180501
Keywords
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Funding
- Royal Society of London for U.K.-China Newton
- National Natural Science Foundation of China [11374059]
- National Key R&D Program of the MOST of China [2016YFA0300203]
- Ministry of Science and Technology of China (Program 973) [2015CB921302]
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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 (mu SR) 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 mu SR 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.
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