Observations of Nematicity, Dopants, and Zero-Bias Conductance Peaks for the Ca_0.9La_0.1FeAs₂ Superconductor.

ABSTRACT: Ca_1-xLa_xFeAs₂ (CLFA112) belongs to a new family of Fe-based superconductors (FeSCs) and has a unique crystal structure featuring an arsenic zigzag chain layer, which has been proposed to be a possible two-dimensional topological insulator. This suggests that CLFA112 is a potential topological superconductor-a platform to realize Majorana fermions. Up to now, even a clear superconducting (SC) gap in CLFA112 has never been observed, and the SC properties of CLFA112 remain largely elusive. In this letter, we report the results of an atomic-scale investigation of the electronic structure of CLFA112 crystals using low-temperature scanning tunneling microscopy (STM). We revealed four different types of surfaces exhibiting distinct electronic properties, with all

SUBMITTER: Kim JJ 

PROVIDER: S-EPMC9962653 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature