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Volume Dependence of H c1, H c2, and ΔP(H c1) in Magnetically Ordered bcc 3He

Abstract

We have used constant-volume pressure measurements over the entire range of molar volumes of bcc solid 3He, 20>v>24 cm3/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 cm3/mole. The 3He was cooled by direct (two-stage) adiabatic demagnetization from T≈100 µK and H=2.5 T where its entropy S≈0. We find the Gruneisen parameters for H c2 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 resugts are significant for testing the mugtiple-exchange model for solid 3He.

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Omelaenko, N.F., Abe, S., Adams, E.D. et al. Volume Dependence of H c1, H c2, and ΔP(H c1) in Magnetically Ordered bcc 3He. Journal of Low Temperature Physics 134, 193–198 (2004). https://doi.org/10.1023/B:JOLT.0000012555.75447.6a

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Keywords

  • Entropy
  • Free Energy
  • Magnetic Material
  • Molar Volume
  • Pressure Measurement