Anisotropic superconductivity in La(O,F)BiSeS crystals revealed by field-angle dependent Andreev reflection spectroscopy
Mohammad Aslam, Sirshendu Gayen, Avtar Singh, Masashi Tanaka, Takuma, Yamaki, Yoshihiko Takano, Goutam Sheet
TL;DR
This study reveals highly anisotropic and unconventional superconductivity in La(O,F)BiSeS crystals through field-angle dependent Andreev reflection spectroscopy, highlighting complex order parameter symmetry.
Contribution
It provides the first detailed characterization of anisotropic superconducting properties and unconventional pairing in La(O,F)BiSeS using spectroscopic techniques.
Findings
Superconducting gap of 0.61 meV at 1.5 K
Anisotropic superconducting behavior observed
Evidence of unconventional pairing mechanisms
Abstract
From field-angle dependent Andreev reflection spectroscopy on single crystals of La(O,F)BiSeS, which belongs to the recently discovered BiCh 2 (Ch = S, Se) based layered superconductors, we found that the superconductivity in La(O,F)BiSeS is highly anisotropic. We measured a superconducting energy gap of 0.61 meV for current injected along c-axis at 1.5 K. Detailed temperature and magnetic field dependent studies of the gap also reveal the presence of unconventional pairing in La(O,F)BiSeS. We show that the observed anisotropic superconducting properties can be attributed to the anisotropy in the superconducting order parameter with a complex symmetry in superconducting La(O,F)BiSeS.
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