Superconductivity has been observed in uranium compounds with partly disordered Cu3Au-type crystal structure and interatomic UU distances of more than 4 A. Low-temperature specific-heat experiments reveal no anomalous enhancement of the electronic specific heat thus distinguishing the present materials from the unconventional superconductors UBe13 and UPt3. © 1985 The American Physical Society.

We present electrical-resistivity, magnetic-susceptibility, specific-heat, and thermal-expansion data for UCd11. The low-temperature specific heat indicates that the electronic subsystem has a highly enhanced specific heat which is partially removed by a phase transition at 5.0 K. © 1984 The American Physical Society.

The high-temperature structural phase transition in URe2 is only moderately influenced by thorium impurities at low concentrations but disappears rapidly when the thorium content exceeds 25%. Replacing thorium in ThRe2 by uranium reduces its critical temperature for the onset of superconductivity but much less drastically than do uranium impurities in metallic thorium. A comparison of the low-temperature specific heats of URe2 and ThRe2 indicates that the density of f-electron states at the Fermi energy EF in URe2 is not large and that the f electrons in URe2 behave similarly to d electrons in non-magnetic d transition metals. © 1986.

A comparison is made of some low-temperature properties of CePt2Si2, CePtAuSi2 and CeAu2Si2. New experimental data on the specific heat, electrical resistivity and magnetic susceptibility of CePtAuSi2, together with published results on the other compounds, reveal that the electronic ground state in these materials varies in a very significant way. In-between local-moment behaviour in CeAu2Si2 and a Kondo-type ground state in CePt2Si2, CePtAuSi2 forms a heavy-electron state at low temperatures. © 1991.

The thermal conductivity λ and the specific heat cp of Ba2YCu3O7-x and La2CuO4 have been measured in the temperature range 0.03 < T < 30 K. The thermal conductivity of sintered Ba2YCu3O7-x samples varies as T2 between 0.7 and 8 K, While below 0.3 K λ (T) is described as a sum of two terms Where one is proportional to T and the other varies like T3. For sintered La2CuO4, λ (T) is distinctly smaller than in sintered Ba2YCu3O7-x in the Whole temperature range. The specific heat of both compounds shows a non-vanishing linear term γ T between 1.4 K and 15 K, Where γ in sintered Ba2YCu3O7-x is nearly an order of magnitude larger than in crystalline La2CuO4. © 1988 Elsevier Science Publishers B.V.