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Single crystals of EuCu2As2 and EuCu2Sb2 were grown from CuAs and CuSbself-flux, respectively. The crystallographic, magnetic, thermal and electronictransport properties of the single crystals were investigated byroom-temperature x-ray diffraction (XRD), magnetic susceptibility \chi versustemperature T, isothermal magnetization M versus magnetic field H, specificheat Cp(T) and electrical resistivity \rho(T) measurements. EuCu2As2crystallizes in the body-centered tetragonal ThCr2Si2-type structure (spacegroup I4/mmm), whereas EuCu2Sb2 crystallizes in the related primitivetetragonal CaBe2Ge2-type structure (space group P4/nmm). The energy-dispersivex-ray spectroscopy and XRD data for the EuCu2Sb2 crystals showed the presenceof vacancies on the Cu sites, yielding the actual composition EuCu1.82Sb2. The\rho(T) and Cp(T) data reveal metallic character for both EuCu2As2 andEuCu1.82Sb2. Antiferromagnetic (AFM) ordering is indicated from the \chi(T),Cp(T), and \rho(T) data for both EuCu2As2 (T_N = 17.5 K) and EuCu1.82Sb2 (T_N =5.1 K). In EuCu1.82Sb2, the ordered-state \chi(T) and M(H) data suggest eithera collinear A-type AFM ordering of Eu+2 spins S=7/2 or a planar noncollinearAFM structure, with the ordered moments oriented in the tetragonal ab plane ineither case. This ordered-moment orientation for the A-type AFM is consistentwith calculations with magnetic dipole interactions. The anisotropic \chi(T)and isothermal M(H) data for EuCu2As2, also containing Eu+2 spins S=7/2,strongly deviate from the predictions of molecular field theory for collinearAFM ordering and the AFM structure appears to be both noncollinear andnoncoplanar.

Antiferromagnetism in EuCu2As2 and EuCu1.82Sb2 Single Crystals