Study of magnetic and magnetocaloric properties of monoclinic and triclinic spin chain CoV$_{2}$O$_{6}$

We have investigated magnetic and magnetocaloric properties of both monoclinic and triclinic phases of CoV$_{2}$O$_{6}$ from magnetization and heat capacity measurements. Conventional and inverse magnetocaloric effects have been observed in both phases of CoV$_{2}$O$_{6}$. For a field change from 0 to 7 T, maximum values of magnetic entropy change and adiabatic temperature change reach 11.8 J kg$^{-1}$ K$^{-1}$ and 9.5 K respectively for monoclinic CoV$_{2}$O$_{6}$ while the corresponding values reach 12.1 J kg$^{-1}$ K$^{-1}$ and 13.1 K for triclinic CoV$_{2}$O$_{6}$. Particularly for triclinic CoV$_{2}$O$_{6}$, the magnetocaloric parameters are quite large in low or moderate field range. Apart from this, we have constructed magnetic phase diagram of monoclinic CoV$_{2}$O$_{6}$ where field-induced complex magnetic phases appear below a certain critical temperature 6 K when external magnetic field is applied along crystallographic easy axis.