YbV\(_3\)Sb\(_4\) and EuV\(_3\)Sb\(_4\), vanadium-based kagome metals with Yb\(^{2+}\) and Eu\(^{2+}\) zig-zag chains

Here we present YbV\(_3\)Sb\(_4\) and EuV\(_3\)Sb\(_4\), two new compounds exhibiting slightly distorted vanadium-based kagome nets interleaved with zig-zag chains of divalent Yb\(^{2+}\) and Eu\(^{2+}\) ions. Single crystal growth methods are reported alongside magnetic, electronic, and thermodynamic measurements. YbV\(_3\)Sb\(_4\) is a nonmagnetic metal with no collective phase transitions observed between 60mK and 300K. Conversely, EuV\(_3\)Sb\(_4\) is a magnetic kagome metal exhibiting easy-plane ferromagnetic-like order below \(T_\text{C}\)=32K with signatures of noncollinearity under low field. Our discovery of YbV\(_3\)Sb\(_4\) and EuV\(_3\)Sb\(_4\) demonstrate another direction for the discovery and development of vanadium-based kagome metals while incorporating the chemical and magnetic degrees of freedom offered by a rare-earth sublattice.