Single crystal studies of a new ternary Europium pnictide EuZn2Sb2

F. Weber1, A. Cosceev1, A. Nateprov1,2, M. Uhlarz1, C. Pfleiderer1 und H. v. Löhneysen1,3
1Physikalisches Institut, Universität Karlsruhe, D-76128 Karlsuhe, Germany
2Institute of Applied Physics, Academei 5, MD-2028 Kishinev, Moldova
3Forschungszentrum Karlsruhe, Institut für Festkörperphysik, D-76021 Karlsruhe, Germany

We report the synthesis and characterisation of a new ternary Europium pnictide EuZn2Sb2. Single crystals were grown by a solid state reaction of high-purity starting materials in carbon glass crucibles. The crystal structure was determined using powder x-ray diffraction. Single crystals were oriented using Laue x-ray diffraction. EuZn2Sb2 is isostructural with the hexagonal Yb compound YbZn2Sb2. The bulk properties were characterised in terms of measurements of the resistivity, magnetoresistance, Hall effect, specific heat and magnetisation. Pronounced features characteristic of antiferromagnetic order with TN = 13.3 K are observed. For field parallel to the c-axis the antiferromagnetism is suppressed above 2.7 T while it persists up to ~ 4.7 T for field in the basal plane. An analysis of the nature of the antiferromagnetic state as inferred from the bulk properties is presented.