Multiband electronic transport in $\alpha$-Yb${}_{1-x}$Sr${}_x$AlB${}_4$ [x = 0, 0.19(3)] single crystals

Abstract

We report on the evidence for the multiband electronic transport in $\alpha$-YbAlB${}_4$ and $\alpha$-Yb${}_{0.81(2)}$Sr${}_{0.19(3)}$AlB${}_4$. Multiband transport reveals itself below 10 K in both compounds via Hall effect measurements, whereas anisotropic magnetic ground state sets in below 3 K in $\alpha$-Yb${}_{0.81(2)}$Sr${}_{0.19(3)}$AlB${}_4$. Our results show that Sr${}^{2+}$ substitution enhances conductivity, but does not change the quasiparticle mass of bands induced by heavy fermion hybridization.

arXiv comment5 pages, 4 figures

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