H.-J. Güntherodt

The electrical resistivity of liquid Fe, Co, Ni and Pd

Abstract The electrical resistivity of Fe, Co, Ni and Pd has been measired at high temperatures in the solid and liquid state. We discuss the results in the light of recent ideas on the Ziman theory and the spin-disorder scattering of liquid transition metals.

Electrical switching in the liquid state

Abstract We have observed a rapid and reversible transition between a highly resistive and conductive state in various liquid alloys of Se, S and Te effected by an electric field. The switching phenomena are of the threshold and sometimes of the memory type.

Lorenz number of solid and liquid gallium

Abstract The Lorenz number of solid and liquid Ga near the melting point has been carefully measured by using a modified Kohlrausch method. We obtained temperature independent values in good agreement with the free-electron Lorenz number.

Electronic structure of liquid transition and rare-earth metals

Abstract We have measured the Hall coefficient, the electrical resistivity and the magnetic susceptibility of liquid transition and rare-earth metals, and of their liquid alloys with normal metals. The interesting results are: A filling-up of the unfilled d-bands of liquid Fe, Co and Ni on alloying, positive Hall coefficients of the liquid rare-earth metals and a change of sign of these Hall coefficients on alloying.

Lorenz number and thermal conductivity of liquid and solid mercury

Abstract The Lorenz number of solid and liquid Hg has been carefully measured by using a modified Kohlrausch method. We obtained temperature independent values in good agreement with the free-electron Lorenz number. The thermal conductivity of liquid Hg has been calculated from measurements of the Lorenz number and the electrical conductivity.

The electrical resistivity of rare earth metals at high temperatures and in the liquid state

Abstract The values of the electrical resistivity of rare earth metals in the liquid state are compared to their corresponding values at low temperatures. In the liquid state the electrical resistivity of the rare earth metals increases nearly linearly across the rare earth series from La to Er. This is contrary to the behaviour at room temperature where the resistivity of the rare earth series has a maximum for Gd.

Lorenz number and thermal conductivity of liquid HgIn

Abstract The Lorenz number of liquid Hgue5f8In alloys has been carefully measured by using a modified Kohlrausch method. We obtained temperature and concentration independent values in good agreement with the free-electron Lorenz number. The thermal conductivity of liquid Hgue5f8In alloys has been calculated from measurements of the Lorenz number and the electrical conductivity.

Electrical resistivity of solid and liquid Gd and Tb

Abstract The electrical resistivities of Gd and Tb have been measured in the solid and liquid state. In the liquid state the values of the electrical resistivities are found to be 195μΩ cm for Gd and 190μΩ cm for Tb at their melting points.

Thermal conductivity of liquid Ga

Abstract We present accurate values of the thermal conductivity of liquid Ga calculated from measurements of the Lorenz number and the electrical conductivity.

Change of sign of the Hall coefficient in liquid alloys

Abstract We have measured the Hall coefficients of several liquid alloys of normal metals with transition metals which show a positive Hall coefficient in the liquid state. We have found that the Hall coefficients are also positive for the transition metal rich alloys, decrease with increasing concentration of the normal metals, pass through zero and finally approach the negative Hall coefficients of the liquid normal metals.