Electronic and magnetic properties of stoichiometric CeAuBi${}_2$

Abstract

We report the electronic and magnetic properties of stoichiometric CeAuBi${}_2$ single crystals. At ambient pressure, CeAuBi${}_2$ orders antiferromagnetically below a Néel temperature ($T_N$) of 19 K. Neutron diffraction experiments revealed an antiferromagnetic propagation vector $\hat{\tau }=[0,0,1/2]$, which doubles the paramagnetic unit cell along the $c$-axis. At low temperatures several metamagnetic transitions are induced by the application of fields parallel to the $c$-axis, suggesting that the magnetic structure of CeAuBi${}_2$ changes as a function of field. At low temperatures, a linear positive magnetoresistance may indicate the presence of band crossings near the Fermi level. Finally, the application of external pressure favors the antiferromagnetic state, indicating that the 4$f$ electrons become more localized.

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