H.U. Künzi

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.

Hall coefficient, electrical resistivity and magnetic susceptibility of liquid Ce

Abstract We have measured the Hall coefficient, the electrical resistivity and the magnetic susceptibility of cerium in the liquid and in the solid state. A positive Hall coefficient was observed in the liquid state. Our results are in good agreement with available data at lower temperatures.

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.

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.

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.

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.

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.

Observation of negative temperature coefficients of electrical resistivity in liquid CeSn alloys

Abstract We have observed negative temperature coefficients (NTC) of the electrical resistivity in liquid CeSn alloys. This is the first example of such behaviour in the liquid rare earth alloys. We suggest, that these NTC arise from potential disorder sacttering and can be interpreted within the Faber-Ziman model.

The electrical resistivity of solid and liquid Dy and Ho

Abstract The electrical resistivity of Dy and Ho have been measured from room temperature up to 1600°C. The values observed in the liquid state are 210 μΩcm respectively and are therefore larger than for Gd and Tb.

Electronic properties of liquid Co - Ge alloys

Abstract The electrical resistivity shows a maximum at a composition of 60 at. % Co. The liquid alloys between 10 and 75 at. % Co show large negative temperature coefficients of the electrical resistivity.