title: Physical properties of EuPd2As2 single crystals.
abstract: The physical properties of self-flux grown EuPd2As2 single crystals have been investigated by means of magnetization M, magnetic susceptibility χ, specific heat Cp, and electrical resistivity ρ measurements versus temperature T and magnetic field H. The crystal structure was determined using powder x-ray diffraction measurements, which confirmed the ThCr2Si2-type body-centered tetragonal structure (space group I4/mmm) reported previously. The ρ(T) data indicate that EuPd2As2 is metallic. The χ(T) data indicate that the Eu(+2) moments have spin S = 7/2 with g = 2. Long-range antiferromagnetic (AFM) ordering is apparent from the χ(T), Cp(T), and ρ(T) measurements. For H∥c the χ(T) indicates two transitions at TN1 = 11.0 K and TN2 = 5.5 K, whereas for H⊥c only one transition is observed at TN1 = 11.0 K. Between TN1 and TN2 the anisotropic χ(T) data suggest a planar noncollinear AFM structure, whereas at T < TN2 the χ(T) and M(H, T) data suggest a spin reorientation transition in which equal numbers of spins cant in opposite directions out of the ab plane. We estimate the critical field at 2 K at which all Eu moments become aligned with the field to be about 22 T. An upturn in ρ at T < TN1 suggests superzone energy gap formation below TN1. This behavior of ρ(T < TN1) is not sensitive to applied magnetic fields up to H = 12 T.
authors.affiliation: Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA. Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner Platz 1, D-14109 Berlin, Germany.
authors.forename: V K
authors.initials: VK
authors.lastname: Anand
authors.forename: D C
authors.initials: DC
authors.lastname: Johnston
mesh_terms: D001151:Arsenic / Q000737:chemistry*; D003460:Crystallization; D017097:Electric Impedance; D005063:Europium / Q000737:chemistry*; D060526:Magnetic Fields; D008422:Materials Testing; D010165:Palladium / Q000737:chemistry*; D013696:Temperature
chemical_list: D005063:Europium; D010165:Palladium; D001151:Arsenic