Abstract
HoAuGe was prepared from the elements by arc melting and subsequentannealing at 1070 K. Its crystal structure was refined fromsingle-crystal x-ray diffractometer data: a = 440.10(5) pm, c = 723.26(9) pm, V = 0.1213(1) nm3, wR2 = 0.0640, 225F2-values and ten variables. The nuclear structure was confirmedby neutron powder diffraction. HoAuGe adopts the NdPtSb-typestructure. The gold and germanium atoms form two-dimensionalinfinite [AuGe] polyanions with intralayer Au-Ge distances of260.5 pm, while the interlayer Au-Ge distances of 304.1 pm are muchlonger. The polyanions are separated by the holmium ions. Magneticsusceptibility, specific heat capacity and neutron diffractionmeasurements reveal antiferromagnetic ordering at TN = 5.6(2) K with further magnetic reordering at T1 = 3.5(2) K andT2 = 2.4(2) K. At higher temperatures Curie-Weiss behaviour isobserved with µeffexp = 10.2(2) µB andΘp = 0(1) K. From the magnetic specific heat afourfold-degenerate ground state is found. The magnetic structureat 1.3 K is described by the propagation vector k⃗ = (1/2,0,0) withthe Ho spins oriented within the bc-plane. As the temperatureincreases towards TN, the magnetic structure becomesincommensurate, which accounts for the observed additionaltransitions below TN.
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