YRu$_3$B$_2$ -- a kagome lattice superconductor

TL;DR

This paper reports the synthesis and characterization of YRu$_3$B$_2$, a kagome lattice superconductor with a critical temperature of 0.63 K, highlighting the role of Ru kagome sublattice in its electronic properties.

Contribution

It introduces YRu$_3$B$_2$ as a new kagome lattice superconductor and analyzes its electronic structure through experiments and density functional theory.

Findings

YRu$_3$B$_2$ is a weakly coupled superconductor with T_c = 0.63 K.

Electronic states near the Fermi level are dominated by the Ru kagome sublattice.

The material exhibits an upper critical field of 0.11 T.

Abstract

We report the synthesis and physical properties of a polycrystalline, hexagonal boride YRu$_3$B$_2$. Our resistivity and heat capacity measurements indicate that YRu$_3$B$_2$ is a weakly coupled superconductor, with critical temperature $T_c$ = 0.63 K and upper critical field $\mu_0 H_{c2}$ (0)=0.11 T. Density functional theory calculations, together with chemical-bonding analysis, reveal that the electronic states at and near the Fermi energy level are dominated by the Ru kagome sublattice.