Electronic and magnetic properties of stoichiometric CeAuBi2

We report the electronic and magnetic properties of stoichiometric ${\mathrm{CeAuBi}}₂$ single crystals. At ambient pressure, ${\mathrm{CeAuBi}}₂$ orders antiferromagnetically below a N\'eel temperature (${T}_N$) of 19 K. Neutron diffraction experiments revealed an antiferromagnetic propagation vector $\stackrel{\ifmmode \hat{}\else \^{}\fi{}}{\ensuremath{\tau}}=[0,0,1/2]$, 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 ${\mathrm{CeAuBi}}₂$ 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 $4f$ electrons become more localized.