Nodeless multigap superconductivity in organic-ion-intercalated (tetrabutyl~ammonium)${}_{0.3}$FeSe

Jinyu Wu, Mengzhu Shi, Jianwei Shu +5

We probe the superconducting order parameter of the organic-ion-intercalated FeSe-based superconductor (tetrabutyl ammonium)${}_{0.3}$FeSe [(TBA)${}_{0.3}$FeSe] using muon-spin relaxat…