Magnetic, electronic and transport properties of high-pressure-synthesized chiralmagnets Mn$_{1-x}$Rh$_x$Ge (B20)

V. A. Sidorov; A. E. Petrova; N. M. Chtchelkatchev; M. V. Magnitskaya; L. N. Fomicheva; D. A. Salamatin; A. V. Nikolaev; I. P. Zibrov; F. Wilhelm; A. Rogalev; A. V. Tsvyashchenko

doi:10.1103/physrevb.98.125121

arXiv · 1806.07165

Magnetic, electronic and transport properties of high-pressure-synthesized chiralmagnets Mn$_{1-x}$Rh$_x$Ge (B20)

V. A. Sidorov·A. E. Petrova·N. M. Chtchelkatchev·M. V. Magnitskaya·L. N. Fomicheva·D. A. Salamatin·A. V. Nikolaev·I. P. Zibrov·F. Wilhelm·A. Rogalev·A. V. Tsvyashchenko

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Abstract

We report on structural, magnetic and transport properties of a new set of the high-pressuresynthesized compounds Mn$_{1-x}$Rh$x$Ge ($0 \leq x \leq 1$) with the chiral magnetic ordering. The magnetic and transport properties depend substantially on the concentration of rhodium (x) and the pressure. The saturation magnetic moment corresponds to a known high-spin value for pristine MnGe (x = 0) and decreases almost linearly with increasing concentration $x$. In addition, XMCD spectra taken at 10 K and 2 T indicate magnetic polarization of the Rh 4d electron states and Ge $4p$ states, which decreases with $x$, too. In rhodium rich compounds ($x \geq 0.5$) the temperature of the magnetic ordering increases significantly with pressure, whereas in manganese rich compounds ($x < 0.5$) the temperature decreases. Three different tendencies are also found for several structural and transport properties. In the intermediate range ($0.3 \leq x \leq 0.7$) samples are semiconducting in the paramagnetic phase, but become metallic in the magnetically ordered state. We carried out ab initio density-functional calculations of Mn$_{1-x}$Rh$_x$Ge at various concentrations $x$ and traced the evolution of electronic and magnetic properties. The calculation results are in good agreement with the measured magnetic moments and qualitatively explain the observed trends in transport properties.

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V. A. Sidorov, A. E. Petrova, N. M. Chtchelkatchev, M. V. Magnitskaya, L. N. Fomicheva, D. A. Salamatin, A. V. Nikolaev, I. P. Zibrov, F. Wilhelm, A. Rogalev, A. V. Tsvyashchenko. 2018-06-19. Magnetic, electronic and transport properties of high-pressure-synthesized chiralmagnets Mn$_{1-x}$Rh$_x$Ge (B20). https://doi.org/10.1103/physrevb.98.125121

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