Quasiparticle Excitations in the Superconducting State of FeSe Probed by Thermal Hall Conductivity in the Vicinity of the BCS-BEC Crossover

15 Nov 2016 Watashige Tatsuya Arsenijević Stevan Yamashita Takuya Terazawa Daiki Onishi Takafumi Opherden Lars Kasahara Shigeru Tokiwa Yoshifumi Kasahara Yuichi Shibauchi Takasada von Löhneysen Hilbert Wosnitza Jochen Matsuda Yuji

There is growing evidence that the superconducting semimetal FeSe ($T_c\sim8$ K) is in the crossover regime between weak-coupling Bardeen-Cooper-Schrieffer (BCS) and strong-coupling Bose-Einstein-condensate (BEC) limits. We report on longitudinal and transverse thermal conductivities, $\kappa_{xx}$ and $\kappa_{xy}$, respectively, in magnetic fields up to 20 T. The field dependences of $\kappa_{xx}$ and $\kappa_{xy}$ imply that a highly anisotropic small superconducting gap forms at the electron Fermi-surface pocket whereas a more isotropic and larger gap forms at the hole pocket... (read more)

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