Fig. 4
From: Magnetic field-temperature phase diagram of multiferroic (NH4)2FeCl5·H2O
Developing the phase diagram. a B–T phase diagram of (NH4)2FeCl5⋅H2O for B || c obtained from an analysis of the magnetization at various temperatures. The zero-field transitions are taken from ref. 24. b Close-up view of the low-field region of the diagram showing the numerous phases labeled according to polarization, magnetostriction, and neutron scattering.24,25,26,27 Here, AFM = antiferromagnetic, PM = paramagnetic, ICC = incommensurate cycloidal, CS = cycloidal spiral, C1 = distorted cycloid, C2 = quasi-collinear, CLS = collinear sinusodial, FE = ferroelectric, and NE = non-electric. Data points from prior studies up to 15 T are indicated by open white circles.24
