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Magnetic susceptibility $\chi$ of Bi$_{2-x}$Mn$_{x}$Se$_3$ ($x = 0.01-0.2$)was measured in the temperature range $4.2-300$ K. For all the samples, aCurie-Weiss behaviour of $\chi(T)$ was revealed with effective magnetic momentsof Mn ions corresponding to the spin value S=5/2, which coupleantiferromagnetically with the paramagnetic Curie temperature $\Theta\sim -50$K. In addition, for the samples of nominal composition $x$ = 0.1 and 0.2 theeffect of a hydrostatic pressure $P$ up to 2 kbar on $\chi$ has been measuredat fixed temperatures 78 and 300 K that allowed to estimate the pressurederivative of $\Theta$ to be d$\Theta$/d$P\sim-0.8$ K/kbar. Based on theobserved behaviour of $\Theta$ with varied Mn concentration and pressure, apossible mechanism of interaction between localized Mn moments is discussed.

Magnetic properties of Mn-doped Bi$_2$Se$_3$ compound: temperature dependence and pressure effects