Hund's coupling mediated multi-channel quantum phase transition of a single magnetic impurity in Fe(Se, Te).

ABSTRACT: Understanding the interplay between individual magnetic impurities and superconductivity is crucial for bottom-up construction of novel phases of matter. Sub-gap bound states that are used in this endeavor are typically considered as independent entities that each result from the exchange scattering between the respective impurity orbitals and electrons of the superconducting condensate. Here we present experimental evidence of individual multi-spin impurities where the sub-gap states are not independent. Specifically, we find that by tuning the energy of the state closest to zero through zero, all other sub-gap states change particle-hole asymmetry as well. We show that this can be understood by including Hund's coupling, which favors high-spin configurations, into a multi-orbital Anderso

SUBMITTER: Uldemolins M 

PROVIDER: S-EPMC11447094 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature