FIELD-DEPENDENCE OF THE SUPERFLUID HE-3 A(1) AND A(2) TRANSITIONS

We present new results on the magnetic field dependence of the superfl uid transition temperatures of the A(1) and A(2) phases of He-3. The T -c(A1) transition temperature has been measured up to 15 T, the T-c(A2 ) up to 12 T at the melting pressure. The temperature was measured by art in situ field independent glass thermometer. The results are in ag reement with extrapolations from earlier experiments, and with calcula tions of the splitting T-c(A1)-T-c(A2) versus magnetic field. We were also able to obtain an estimate of the quadratic terms of the splittin g, and of each of the transition temperatures. The measured quadratic terms are smaller than calculated the negative coefficient for the T-c (A2) quadratic term bring quite unexpected.