Antiferromagnetism With Divalent Eu In Euni5as3

We have successfully synthesized single crystals of EuNi5As3 using a flux method, and we present a comprehensive study of the physical properties using magnetic susceptibility, specific heat, electrical resistivity, thermoelectric power, and x-ray absorption spectroscopy (XAS) measurements. EuNi5As3 undergoes two close antiferromagnetic transitions at respective temperatures of T-N1 = 7.2 K and T-N2 = 6.4 K, which are associated with the Eu2+ moments. Both transitions are suppressed upon applying a field, and we map the temperature- field phase diagrams for fields applied parallel and perpendicular to the easy a axis. XAS measurements reveal that the Eu is strongly divalent, with very little temperature dependence, indicating the localized Eu2+ nature of EuNi5As3, with a lack of evidence for heavy-fermion behavior.