Low-temperature magnetic, thermodynamic, and transport properties of antiferromagnetic CeAuSn single crystals

We present measurements of the magnetization M, specific heat C, resistivity ρ, and magnetoresistance MR of single-crystalline hexagonal CeAuSn for temperature down to T = 1.6 K and in magnetic field up to B = 12 T. Antiferromagnetic ordering at TN = 4.4 K is observed as previously found for polycrystalline samples. A strong magnetic easy-plane anisotropy of M for B perpendicular and parallel to the c direction is found with M⊥/M|| ≈ 15 in B = 0.1 T around TN, which is attributed to crystal-electric-field anisotropy. The analysis of the magnetic susceptibility indicates ferromagnetic correlations above TN. Measurements of M(T ) under hydrostatic pressure P show that TN(P ) increases linearly with P at a small rate of 0.035 K/kbar up to 4 kbar and