Nuclear Magnetic Susceptibility of SolidHe3and of Dilute Solid Mixtures ofHe4

Abstract

Phys. Fluids 11, 925 (1968)]. Also, the comparison of these calculations {based on repulsive potentials)with experiments on gaseous xenon shows good agreement, indicating that the effect of the attractive part of the potential on S(kco) would not be great. For this comparison and a general review see S. Yip, J. Acoust. Soc. Am, 49, 941 (1971).Continuous-wave NMR was used to study the temperature dependence of the static nuclear magnetic susceptibility of solid He' and solid mixtures of He" in He'. Measurements were performed in the purest sample {3. 7&(10 ' He' in He') at four molar volumes {21, 22, 23, and 24 cm'/mole) in the bcc phase, and at several He' concentrations ranging from 3.7)&10 ' to 2.0)&10at 21 and 23 cm'/mole. The temperature range of the measurements was from 0.95 to 0.32 K. The data were fitted to a Curie -Weiss law with an rms deviation from best fit of less than 10-' and best values of the Weiss constant 0 were obtained. Susceptibilities and temperatures were measured to better than 0.1%. The temperature scale was based upon the susceptibility of the purest, most-dense sample. The desired accuracy in the susceptibility measurements necessitated a new method of data reduction. The accuracy in ihe extracted values of 0 was better than +1 mk. The values of 0 in the purest sample ( -0.24+0.82 mK at 21 cm'/mole, -1.03+1.06 mK at 22 cm"/mole, -1.49+0.27 mK at 23 cm'/mole, and -3.07+0.78 rnK at 24 cm'/mole) agreed within experimental uncertainty with those of earlier workers, operating at lower temperatures. They provide a high-temperature check on those measurements. The measured effects on 0 of the He" impurity are consistent with the work of Richards and Homer, but the measurements show an improved accuracy. The data, as a function of x, the atomic fraction of He", have been fitted to the equation 8(x) =I9 (1+gx}. Values of g of -430+450 and -19+10 were obtained at 21 and 23 cm'/mole, respectively. Address hp 6066 rf Osc. . Rectifier

Variation of the exchange frequencies with density in bcc solid 3He

“…-The values of the Curie Weiss constant 0 obtained by susceptibility measurements are compared to different fits consistent with the pressure measurements of d8jdv [7]. The experimental points are from : N Kirk et al [12], 0 Sites et al [ 13], V Johnson and Wheatley [14], A Bemat and Cohen [15], 0 Morii et al [16], X Bakalyar et al [17], ~ Prewitt and Goodkind [18], Hata et al (1981) [19], T. Hata et al ( 1983) [5].…”