A STUDY OF VIBRATING WIRES FOR VISCOMETRY IN HIGH MAGNETIC-FIELDS

We report on a systematic study of the temperature and magnetic field dependence of the intrinsic damping and the resonance frequency of vib rating wires in magnetic fields up to 11.5T and at temperatures 1 mK < T < 250 mK. The aim is to test the applicability of various materials for viscometry in spin polarized He-3-He-4 solutions. The materials i nvestigated are NbTi in the superconducting and normal state, the allo ys Manganin and PtW, a gold plated glass wire, and three Ag wires wher e one has been exposed to a heat treatment. For all samples the impact of the magnetic field on the mechanical properties of the wires is mu ch larger than any temperature dependent effects.