H.L. Luo

Low temperature heat-capacity measurements of V3Ga and Nb3Al

Abstract By low temperature heat capacity measurements using the a.c. technique, we show indirectly that martensitic transformations do occur in V3Ga and Nb3Al.

Electrical and magnetic properties of Au-Ni alloys

Completely random solid solutions have been obtained for the entire range of Au-Ni alloys by the splat quenching technique. In an attempt to compare the Au-Ni system with the similar Cu-Ni system, the electrical resistance and magnetization were measured over the range from 20 to 60 at%Ni. For corresponding composition the Curie temperatures are consistent, in the two systems, while the temperature dependences of electrical resistance are quite different from those of Cu-Ni alloys.

Superconductivity and magnetic susceptibility studies of the cubic Laves phase alloys CeRu2 - xCox

Measurements of the room temperature lattice parameter, the superconducting transition temperature and the magnetic susceptibility over the temperature range 1.5 to 300 K have been made on the pseudo-binary alloy system CeRu2-xCox. Tc is depressed from the values for the terminal compounds and superconductivity could not be detected above similar 0.33 K for 0.2 < x < 1.7. From the form of the variation of Tc with Co substitution and the susceptibility measurements it is concluded that the destruction of the superconductivity in CeRu2 is due to localized spin fluctuations associated with the Co. The effects of transition metal and rare earth substitution into CeRu2 are compared and discussed.

Superconductivity of the phase CeCo2 at zero and high pressure

Abstract The superconducting transition temperatures of a number of alloys in the homogeneity range about the composition CeCo 2 have been measured and were observed to be practically pressure-independent.

The specific heat of bulk amorphous arsenic

Abstract The specific heat of bulk amorphous arsenic deposited from the vapor at 415°K has been measured between 1.8 and 20°K. A comparison with compacted amorphous As films deposited at room temperature reveals appreciable differences in the form of C/T 3 . The results indicate a relative increase in the density of low frequency vibrational modes in the bulk amorphous As. The specific heat measurements support x-ray and Raman scattering studies that suggest variations in the local structure of amorphous As prepared under different deposition conditions. A comparison with neutron scattering measurements in bulk amorphous As also indicates an underestimate of the low frequency density of states.

Superconductivity in Pd-Si-H(D) alloys

Abstract Superconductivity is reported for Pd-Si-H(D) alloys in the regions of solid solution and the amorphous phase. The isotope effect for the former has the inverse sign but that of the latter is normal. The results are discussed in connection with existing theories.

Specific heat of Au4V

Abstract The specific heat of Au 4 V has been measured from 1.5 to 60°K. An anomaly was observed near 50°K. The electronic specific heat and the Debye temperature were calculated, and the magnetic entropy was crudely estimated.

The electrical resistivity of Au4V

Abstract A resistivity anomaly has been observed near the Curie temperature in ordered Au 4 V. The temperature dependence of the resistivity of Au 4 V is qualitatively discussed in terms of the two-band model of s-d scattering; similarity between Au 4 V and Ni is moted. Results of resistivity measurements on the disordered alloy 20 at.% V, Au are also presented.

Electrical resistivity of metastable Ag-Ni alloys

Abstract We have successfully prepared solid solution metal films of Ag-Ni with Ni content to 23.4 at.%. Four-probe resistivity measurements were conducted between 2.5 and 300°K and while no anomalies of the magnetic type were observed, the temperature dependence of the resistivity indicates significant deviations from Matthiessens rule.

Temperature-dependence in the susceptibility of Al3V☆

Abstract The susceptibility of Al 3 V has been measured between 0.4 and 293°K and has been found to satisfy a Curie-Weiss expression with a critical temperature of ≈ -65°K and an effective moment per vanadium ion of ≈ 0.32. No magnetic ordering appears to take place. These results are compared with those on Au-V alloys and Au 4 V.