Phenomenological treatment of exchange effects in solid3He in the high-temperature limit

Using an expansion in1/T andH2 for the free energy, we phenomenologically obtain a good fit to the existing high-temperature thermodynamic data for bcc 3 He at both high and low magnetic field. In addition, we show that our coefficients can be obtained by forming a synthesis of the independent theories resulting from (1) next-near neighbor exchange and (2) spin—phonon coupling.