Experimental Thermal Conductivity of Helium-3

Abstract

The thermal conductivity of liquid He* at pressures of 0.11, 6.78, and 27.0 atm has been measured down to 0.06°K. For each pressure the conductivity passes through a minimum, the temperature of the minimum decreasing with increasing pressure. At temperatures greater than J°K the thermal conductivity is nearly independent of pressure. The effect of pressure is to decrease the conductivity. The pressure effect increases monotonically down to the lowest temperature.

Thermal Conductivity of PureHe3and of Dilute Solutions ofHe3in<

“…3 So far as the magnitude of the thermal conductivity is concerned, the present results fall about 15% below those of Anderson, Salinger, and Wheat ley 12 near 30 mdeg K, although at higher temperatures the results of the latter authors are over 10% greater than those obtained by Anderson, Connolly, Vilches, and Wheatley. 13 We believe that a careful study of the properties of pure He 3 at constant pressure over an extended temperature range is in order.…”

Thermal conductivity of helium-3 between 3 mK and 300 K

“…Later on, Anderson et al [5] cooled the liquid 3 He sample from 0.2 K down to 0.026 K and found the thermal conductivity decreased as the temperature increased. These experiments together indicated a minimum in the conductivity between 0.2 and 0.24 K. In order to verify this phenomenon, Anderson et al [6] and Connolly [7] again measured the thermal conductivity over a temperature range as wide as possible and extended all measurements to higher pressures up to 2.7 MPa rather than only low pressure conditions. Anderson et al's measurements were approximately 15% below the data of Lee and Fairbank where the measurements overlapped.…”