A single crystal study of Kagome metals U$_2$Mn$_3$Ge and U$_2$Fe$_3$Ge

TL;DR

This study synthesizes and characterizes single crystals of U2Mn3Ge and U2Fe3Ge with Kagome lattice structures, revealing complex magnetic behaviors, heavy fermion characteristics, and potential for exploring magnetism and Kondo physics interplay.

Contribution

It provides the first detailed physical property characterization of U2Mn3Ge and U2Fe3Ge Kagome metals, highlighting their magnetic and heavy fermion properties.

Findings

U2Fe3Ge shows ferromagnetism and Anomalous Hall Effect.

U2Mn3Ge exhibits complex magnetic structure.

Both compounds display large Sommerfeld coefficients indicating heavy fermion behavior.

Abstract

Single crystals of U$_2$Mn$_3$Ge and and U$_2$Fe$_3$Ge with a Kagome lattice structure were synthesized using a high-temperature self-flux crystal growth method. The physical properties of these crystals were characterized through measurements of resistivity, magnetism, and specific heat. U$_2$Fe$_3$Ge exhibits ferromagnetic ground state and Anomalous Hall Effect, and U$_2$Mn$_3$Ge demonstrates a complex magnetic structure. Both compounds exhibit large Sommerfeld coefficient, indicating coexistence of heavy Fermion behavior with magnetism. Our results suggest that this U$_2$TM$_3$Ge (TM = Mn, Fe, Co) family is a promising platform to investigate the interplay of magnetism, Kondo physics and the Kagome lattice.