The low temperature viscosity of normal liquid3He
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Measurements between 35 and 110 mK along the melting curve indicate that in the normal Fermi liquid region the viscosity of 3 He is given by (T 2 ) -1 =a-bT n with n=1.0. The measured constants are a=0.816 and b=4.43 for in micropoise and T in Kelvin. Very little solid could be formed in this particular apparatus without immobilizing the vibrating wire viscometer. Patterns were observed in the solidification, however, which suggest that such a device could be operated at much lower temperatures in a compressional cooling cell of appropriate design. A systematic study was made of the excitation of different vibrational modes of the viscometer by varying the magnetic field orientation and the nature of the driving current. The use of tone burst and dc, as well as CW, excitation currents allows the same viscometer to be used over a wide range of viscosities. 1973 Plenum Publishing Corporation.
