The New High-entropy Compound RhMnFeCoGe4 with Cubic Non-centrosymmetric B20 Structure

V. A. Sidorov; V. N. Krasnorussky; A. V. Bokov; Z. N. Volkova; A. P. Gerashchenko; N. M. Chtchelkatchev; M. V. Magnitskaya; D. A. Salamatin; A. V. Semeno; V. V. Brazhkin; A. V. Tsvyashchenko

The New High-entropy Compound RhMnFeCoGe4 with Cubic Non-centrosymmetric B20 Structure

Materials Science 2026-08-04 v1 Strongly Correlated Electrons

Authors: V. A. Sidorov , V. N. Krasnorussky , A. V. Bokov , Z. N. Volkova , A. P. Gerashchenko , N. M. Chtchelkatchev , M. V. Magnitskaya , D. A. Salamatin , A. V. Semeno , V. V. Brazhkin , A. V. Tsvyashchenko

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Abstract

A novel high-entropy compound, RhMnFeCoGe $_4$ , with a cubic non-centrosymmetric B20 struc- ture, has been synthesized under conditions of high pressure and temperature. The electrical transport and magnetic properties of the obtained compound at both ambient and elevated pres- sures have been investigated. In addition, nuclear magnetic resonance (NMR) spectra were obtained at 4.2 K and ab initio calculations were performed. The new material exhibits ferromag- netic behavior with a critical temperature of $T_C$ = 146 K and a spontaneous moment of 2.5 $\mu_B$ per formula unit. The magnetization data obtained at the critical region yielded the critical temperature and exponents, which were found to be $T_C$ = 146(1) K, $\beta$ = 0.337(1), $\gamma$ = 1.121(1), and $\delta$ = 4.326(1). The magnetic moments of Mn and Co were determined from NMR spectra to be 2.2 $\mu_B$ and 0.5 $\mu_B$ , respectively. Ab initio calculations yielded reasonable values for the lattice parameter and the magnetic moments of all constituents. The density of states and band structure are determined for both paramagnetic and ferromagnetic states. Lattice compression results in the increase in the $T_C$ .

Keywords

high-entropy compound B20 structure ferromagnetism high pressure synthesis nuclear magnetic resonance ab initio calculations electrical transport

Cite

@article{arxiv.2608.03523,
  title  = {The New High-entropy Compound RhMnFeCoGe4 with Cubic Non-centrosymmetric B20 Structure},
  author = {V. A. Sidorov and V. N. Krasnorussky and A. V. Bokov and Z. N. Volkova and A. P. Gerashchenko and N. M. Chtchelkatchev and M. V. Magnitskaya and D. A. Salamatin and A. V. Semeno and V. V. Brazhkin and A. V. Tsvyashchenko},
  journal= {arXiv preprint arXiv:2608.03523},
  year   = {2026}
}