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arXiv · 1509.09026

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

A. S. Panfilov·G. E. Grechnev·A. V. Fedorchenko·K. Conder·E. V. Pomjakushina
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Abstract

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, a Curie-Weiss behaviour of $\chi(T)$ 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 $\Theta\sim -50$ 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 $\chi$ has been measured at fixed temperatures 78 and 300 K that allowed to estimate the pressure derivative of $\Theta$ to be d$\Theta$/d$P\sim-0.8$ K/kbar. Based on the observed behaviour of $\Theta$ with varied Mn concentration and pressure, a possible mechanism of interaction between localized Mn moments is discussed.

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A. S. Panfilov, G. E. Grechnev, A. V. Fedorchenko, K. Conder, E. V. Pomjakushina. 2015-09-30. Magnetic properties of Mn-doped Bi$_2$Se$_3$ compound: temperature dependence and pressure effects. https://arxiv.org/abs/1509.09026

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