  Materials with transition metals in triangular lattices are of great interest
for their potential combination of strong correlation, exotic magnetism and
electronic topology. Kagome nets are of particular importance since the
discovery of geometrically frustrated magnetism and topological band structures
in crystals like Herbertsmithite and Fe3Sn2, respectively. KV3Sb5 was
discovered to be a layered topological metal with a Kagome net of vanadium.
Here, we fabricated Josephson Junctions (JJ) of K1-xV3Sb5 and induced
superconductivity over long junction lengths. Through magnetoresistance and
current vs. phase measurements, we observed magnetic field sweeping direction
dependent magnetoresistance, and an anisotropic interference pattern with a
Fraunhofer pattern for in-plane magnetic field, but a suppression of critical
current for out-of-plane magnetic field. These results indicate an anisotropic
internal magnetic field in K1-xV3Sb5 which influences the superconducting
coupling in the junction, possibly giving rise to spin-triplet
superconductivity. In addition, the observation of long-lived fast oscillations
shows evidence of spatially localized conducting channels arising from edge
states. These observations pave the way for studying unconventional
superconductivity and Josephson device based on Kagome metals with electron
correlation and topology.
