Figure 2: High-pressure evolution of the effective magnetic dimensionality and Néel temperature of CuO.
From: Room-temperature spin-spiral multiferroicity in high-pressure cupric oxide
(a) Ratio between the two largest magnetic exchange interactions (Jz/J2a). The 1D character of the magnetic structure is first enhanced with pressure (up to 20 GPa) and is then reduced. (b) Pressure dependence of the Néel temperature of CuO. Experimental data (in blue) measured up to 1.8 GPa (ref. 23) are compared with the result of the semi-empirical RPA expression (in red) for quasi-1D antiferromagnets22. The inset provides a zoomed view for pressure values smaller than 3 GPa. The experimental error bar23 of about ±2 K, estimated from a high-pressure neutron diffraction investigation, is shown using blue bars.
