Pressure-induced modifications of the magnetic order in the spin-chain compound $\mathrm{Ca_{3}Co_{2}O_{6}}$

The structural and magnetic properties of the $\mathrm{Ca_{3}Co_{2}O_{6}}$ spin-chain compound have been studied by means ofneutron and x-ray powder diffraction at pressures up to 6.8 and 32 GPa, respectively. A suppression of the initialspin-density wave state $(T_{N} = 25 K)$ and stabilization of the collinear commensurate antiferromagnetic (AFM)state at high pressures $(T_{NC} = 26 K at P = 2.1$ GPa) were observed. The pressure behavior of the competingintra- and interchain magnetic interactions was analyzed on the basis of obtained structural data and their role inthe formation of the magnetic phase diagram is discussed. The pressure behavior of the Néel temperature of thecommensurate AFM phase was evaluated within the mean field theory approach and a good agreement with theexperimental value $dT_{NC} /dP = 0.65 K/GPa$ was obtained