Volume Dependence of H<sub>c1</sub>, H<sub>c2</sub>, and ΔP(H<sub>c1</sub>) in Magnetically Ordered bcc<sup>3</sup>He

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We have used constant-volume pressure measurements over the entire range of molar volumes of bcc solid 3 He, 20<v<24 cm 3 /mole, to determine the zero-temperature critical field H c1 and the pressure discontinuity ΔP(H c1 ) between the two antiferromagnetically ordered phases. The upper critical field H c2 has been determined for 20<v<21. 75 cm 3 /mole. The 3 He was cooled by direct (two-stage) adiabatic demagnetization from T100 μK and H=2.5 T where its entropy S0. We find the Gruneisen parameters for H c1 and ΔP to be larger than in previous work, but still smaller than for H c2 and other physical quantities such as the Neel temperature T N and e 1/2 2, where e 2 is the coefficient of the second-order term in the free energy of the paramagnetic phase. These results are significant for testing the multiple-exchange model for solid 3 He.

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