A study of magnetic susceptibility of single-crystal gadolinium under all-round compression

We measured the dependences of the initial magnetic susceptibility on the temperature $\chi(T)$ of a Gd single crystal along the $c$ and $b$ crystallographic axes in external magnetic fields and up to 1 GPa. The $\chi(T)$ curves were found to have maxima at the Curie temperature $\Theta_C$, the spin-reorientation transition temperature $\Theta_{SR}$, and the temperature $\Theta_A = 140$ К. The derivatives $\partial\Theta_C/\partial P$ and $\partial\Theta_{SR}/\partial P$ are determined, which are -13 and -67 K GPa$^{-1}$ along the $c$ axis and -12 and -29 K GPa$^{-1}$ along the $b$ axis, respectively.