We have investigated the source of the anisotropic susceptibility of UZn8.5 by preparing single crystals of UxTh 1-xZn8.5 for small x. Preliminary indications are that anisotropic exchange, rather than crystal field effects, are responsible for the anisotropy, but possible impurity contributions to the (anisotropic) susceptibility of the ThZn8.5 do not permit a stronger statement. Further measurements for small x show that both the electronic specific heat and the susceptibility at low temperature are strongly enhanced, and that Kondo-type resistivity minima are observed. The enhancements are somewhat reduced in the concentrated system UZn8.5.

Electrical resistivity, thermoelectric power, magnetic susceptibility and neutron scattering experiments on YBa2-yLayCu3Ox, with y = 1, show that this compound is neither superconductive nor magnetically ordered but are consistent with it being an electronically localized system. © 1988.

Valence band photoemission spectra of single crystals of EuBa2Cu3O6.7, cleaved and measured at T=20 K, are presented. A stable Fermi edge is observed, whose amplitude is ≈10% of the maximum valence band intensity. This suggests metallic behavior. Except for 1 eV shift toward higher binding energy, the results compare favorably with previous band calculations, and hint at a re-examination of theories based purely on a localized electronic structure. There is evidence for both Cu-3d and O-2p occupation at EF, as predicted by band calculations. © 1988.