Pressure variations of the order parameter η of NH4Cl are measured by second harmonic generation of light. The transition is continuous above 1.5 kbar; below, a phase coexistence is observed which may induce plastic deformations. Possible interpretations of the data with critical exponents and with the Landau theory are discussed.
No takes yet. Share an insight, caveat, or question.
Dolino et al. (1979) studied this question.
Synapse has enriched 3 closely related papers on similar clinical questions. Consider them for comparative context: