Anomalous Magnetotransport in the Paramagnetic State of a Magnetic Kagome Metal EuTi${}_3$Bi${}_4$

Abstract

We investigate the electrical transport properties of a magnetic kagome metal EuTi${}_3$Bi${}_4$, which undergoes magnetic ordering below $T_{\mathrm{c}}=10.5$ K. Unlike typical magnets showing anomalous magnetotransport in their ordered states, EuTi${}_3$Bi${}_4$ exhibits unusual magnetotransport behaviors in its paramagnetic phase. Specifically, the magnetoconductivity shows a linear dependence on magnetic field at low fields below $\sim 1$ T, and the Hall conductivity undergoes a sign change below about 2 T. These behaviors resemble those observed in the charge density wave (CDW) phase of kagome metals $A$V${}_3$Sb${}_5$ ($A$ = K, Rb, Cs). The anomalous magnetotransport in $A$V${}_3$Sb${}_5$ has commonly been attributed to the possible emergence of a time-reversal symmetry breaking chiral CDW order. However, given the absence of CDW in EuTi${}_3$Bi${}_4$ and its manifestation exclusively in the paramagnetic state, the anomalous magnetotransport observed in EuTi${}_3$Bi${}_4$ is likely associated with multiband transport and/or the van Hove singularities near the Fermi level.

9 pages, 5 figures

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Cited by in corpus (3)

• Anomalous Nernst Effect and Its Implications for Time-Reversal Symmetry Breaking in Kagome Metal ScV6Sn6
• Revealing magnetism in the distorted kagome $R$Ti${}_3$Bi${}_4$ ($R$ = Nd, Sm, Gd) via ARPES and XMCD
• Synergistic doping and stabilization of magnetically tunable LnTi${}_3$(Sb,Sn)${}_4$ (Ln:Ce--Gd) kagome metals