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

Magnetic susceptibility $χ$ 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, a Curie-Weiss behaviour of $χ(T)$ was revealed with effective magnetic moments of Mn ions corresponding to the spin value S=5/2, which couple antiferromagnetically with the paramagnetic Curie temperature $Θ\sim -50$ K. In addition, for the samples of nominal composition $x$ = 0.1 and 0.2 the effect of a hydrostatic pressure $P$ up to 2 kbar on $χ$ has been measured at fixed temperatures 78 and 300 K that allowed to estimate the pressure derivative of $Θ$ to be d$Θ$/d$P\sim-0.8$ K/kbar. Based on the observed behaviour of $Θ$ with varied Mn concentration and pressure, a possible mechanism of interaction between localized Mn moments is discussed.

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