Terahertz third-harmonic spectroscopy reveals a sub-gap collective mode in superconducting FeSe, attributed to a Bardasis-Schrieffer mode of an s+d-wave order parameter.
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A new collective mode in an iron-based superconductor with electronic nematicity
Terahertz third-harmonic spectroscopy reveals a sub-gap collective mode in superconducting FeSe, attributed to a Bardasis-Schrieffer mode of an s+d-wave order parameter.