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Thermodynamic measurements in magnetically ordered solid3He

Abstract

Measurements of the melting pressure and constant-volume pressure of solid3He have been made in the vicinity of the various magnetic-ordering transitions. Data have been obtained at several magnetic fields for both the low-field phase and the high-field phase, with particular attention given to the region of the polycritical point. The absence of a latent heat indicates that the transition from the paramagnetic to the high-field phase is second order or λ type. A spin-wave velocity of 6.95 cm/sec was obtained from theT 4 temperature dependence of the melting pressure in the high-field phase forB=0.495 T. These data provide the entropy and volume discontinuities as functions of field along the first-order low-field phase boundary. The volume dependence of the transition temperatures has been extracted from these and other data.

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Adams, E.D., Tang, Y.H. & Uhlig, K. Thermodynamic measurements in magnetically ordered solid3He. J Low Temp Phys 84, 109–131 (1991). https://doi.org/10.1007/BF00681619

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Keywords

  • Magnetic Field
  • Entropy
  • Transition Temperature
  • Latent Heat
  • Magnetic Material