Phase diagram

See also source files: he3_phase.f and he3_const.f.
Phase diagram in a magnetic field can be found in the B$_2$-phase section.

Examples

Library functions

Vapor pressure and critical point (1962 He3 scale of temperatures)

`he3_pvap(T)`	Vapor pressure [bar] vs temperature [K], $T = 0.2 - 3.324$ K
`he3_pcr`	Gas-liquid critical point pressure, 1.16317 [bar]
`he3_tcr`	Gas-liquid critical point temperature, 3.324 [K]

Greywall-86 temperature scale

The scale is defined below 0.25 mK. Melting curve is extended to 31 K using data from PLTS2000 (0.25-1 K, including data for the melting curve minimum), Abraham et al. and Mills et al. (2.0-31 K).

`he3_pmelt(T)`	Melting pressure [bar] vs temperature [K], $T = 0.0009 - 31$ K
`he3_pm`	Melting curve minimum pressure, $29.3113$ [bar]
`he3_tm`	Melting curve minimum temperature, $0.31524$ [K]
`he3_pa`	Superfluid trans. at melting curve, pressure, 34.3380 [bar]
`he3_ta`	Superfluid trans. at melting curve, temp., 2.491 [mK]
`he3_pb`	A-B trans. at melting curve, pressure, 34.3580 [bar]
`he3_tb`	A-B trans. at melting curve, temp., 1.932 [mK]
`he3_ps`	Neel transition at melting curve, pressure, 34.3905 [bar]
`he3_ts`	Neel transition at melting curve, temp., 0.9291 [mK]
`he3_tc(P)`	Superfluid transition temperature [mK] vs pressure [bar], $P = 0 - 34.358 $ bar
`he3_tab(P)`	A-B transition temperature [mK] vs pressure [bar], $P = 0 - 34.3609$ bar, below 21.22 bar is equal to `he3_tc`
`he3_tabn`	A-B-Normal point temperature, 2.2730 [mK]
`he3_pabn`	A-B-Normal point pressure, 21.22 [bar]

PLTS-2000 temperature scale

The scale includes the melting curve in the range 0.9mK - 1K and critical points on it. Melting curve is extended to 31 K using data from Abraham et al. and Mills et al. Functions for $T_c$ and $T_{ab}$, as well as A-B-N critical point are interpoleted using Greywall's data.

`he3_pmelt_plts(T)`	PLTS-2000 melting presure [bar] vs temperature [K].
`he3_pa_plts`	Superfluid trans. at melting curve, pressure, 34.3407 [bar]
`he3_ta_plts`	Superfluid trans. at melting curve, temp., 2.444 [mK]
`he3_pb_plts`	A-B trans. at melting curve, pressure, 34.3609 [bar]
`he3_tb_plts`	A-B trans. at melting curve, temp., 1.896 [mK]
`he3_ps_plts`	Neel transition at melting curve, pressure, 34.3934 [bar]
`he3_ts_plts`	Neel transition at melting curve, temp., 0.902 [mK]
`he3_tc_plts(P)`	Superfluid transition temperature [mK] vs pressure [bar]
`he3_tab_plts(P)`	A-B transition temperature [mK] vs pressure [bar]
`he3_tabn_plts`	A-B-Normal point temperature, 2.2315 [mK]
`he3_pabn_plts`	A-B-Normal point pressure, 21.222 [bar]

TODO: Add switch between Greywall and PLTS scales.

References

The 1962 He3 scale of temperatures IV. Tables.
Sherman, R.H.; Sydoriak, S.G.; Roberts, T.R.
National Bureau of Standards, 1964.
https://archive.org/details/jresv68An6p579
3He specific heat and thermometry at millikelvin temperatures.
Dennis S. Greywall
Phus.Rev.B 33, 7520 (1986)
See f.5 for Tc(P), f.15 for Tab(P), f.A1 for melting pressure.
Properties of Liquid Helium 3
Abraham, B. M.; Osborne, D. W.; Weinstock, B.
Science, 117, 121-126 (1953)
Melting Curves of He3, He4, H2, D2, Ne, N2, and O2 up to 3500 kg/cm2.
R. L. Mills and E. R. Grilly
Phys. Rev. 99, 480-486 (1955)
The Provisional Low Temperature Scale from 0.9 mK to 1 K, PLTS-2000.
International Bureau of Weights and Measures. Retrieved December 2013.
http://www.bipm.org/utils/en/pdf/PLTS-2000.pdf