Magnetic ordering in 3He nano-clusters

Simultaneous measurements of magnetic susceptibility from 0.5 to 10 mK and pressure from 2,88 to 3.54 MPa have been made in He-3 nano-clusters embedded in a He-4 matrix following phase separation. The susceptibility of the 3.54 MPa, all-solid sample behaves similarly to that of bulk He-3 for upsilon = 21.3 cm(3)/mole, with a Weiss constant theta = -250muK. For the 2.88 MPa, liquid-droplet sample, theta = 140muK, indicating a ferromagnetic tendency, similar to 2-D films at some coverages. At intermediate pressures, chi has a peak near 1.05 mK, but without a discontinuity. For all samples, chi had a solid-like contribution to the lowest temperatures. Magnetic ordering in nano-clusters appears to be different than the U2D2 phase of bulk He-3.