Magnetic Kapitza conductance at the interface between superfluid phases of liquid He3 and CMN

A preliminary calculation is presented of what is expected for the rate at which spin-spin interactions produce energy transfer (Kapitza conductance Rsub(K)-1) across an interface between an array of paramagnetic local moments, of the type encountered in CMN, and the degenerate Fermi gas of liquid He3 in its superfluid phases A and B. It is found that, for decreasing temperature, while the Kapitza conductance Rsub(K)-1 increases in the normal phase of He3, it then decreases once one reaches the A phase transition and decreases even more in the B phase, so that one would expect very tiny heat transfer near 0K, which sounds reasonable physically. The only experiment so far agrees with this conjecture for the A phase, but goes in the opposite direction from prediction in the B phase. (Auth.)