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 gradually saturates approaching P=16kbar. Zero-field ΔC/T, the phonon contribution to C being subtracted, is proportional to T2 below TN indicating a gapless spin-wave spectrum. It is found that all ΔC(T,B)/T curves for B=0-9 T cross at the same temperature, providing an example of a particularly well defined isosbestic point in a very narrow region around Tiso=6.6 K. Finally, ρ(T) and MR experiments with current perpendicular and parallel to B allow us to separate orbital effects from the Zeeman splitting.
|期刊||Physical Review B - Condensed Matter and Materials Physics|
|出版狀態||Published - 2015 4月 16|
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