Record Increase in the Curie Temperature up to Room Values in the Noncentrosymmetric Magnet Mn1 – xRhxSi

IF 1.4 4区物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY

JETP Letters Pub Date : 2025-03-05 DOI:10.1134/S0021364024604482

S. V. Demishev, V. N. Krasnorussky, A. E. Os’kin, A. V. Bokov, I. P. Zibrov, D. A. Salamatin, A. V. Semeno, V. A. Sidorov, P. V. Enkovich, V. V. Brazhkin, A. V. Tsvyashchenko

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Abstract

The magnetic properties of Mn_1–xRh_xSi solid solutions with a noncentrosymmetric structure B20 synthesized at a pressure of 8 GPa and temperatures of 1500–1770 K have been studied in detail in a wide temperature range of 2–300 K in magnetic fields up to 9 T. An anomalous increase in the Curie temperature T_C of compounds with 0.15 ≤ x ≤ 0.8 by a factor of 8.4–11.5 compared to the pure helical magnet MnSi has been found. It has been established that the Curie temperature T_C increases with the rhodium content to T_C(x = 0.15) = (244 ± 4) K, T_C(x = 0.4) = (299 ± 5) K, and T_C(x = 0.8) = (334 ± 6) K. Uniquely high magnetic transition temperatures up to room values occur in the disordered ferromagnetic Griffiths phase and may be due to the spin-fluctuation mechanism of enhancement of the magnetic interaction.

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来源期刊

JETP Letters 物理-物理：综合

CiteScore

2.40

自引率

30.80%

发文量

164

审稿时长

3-6 weeks

期刊介绍： All topics of experimental and theoretical physics including gravitation, field theory, elementary particles and nuclei, plasma, nonlinear phenomena, condensed matter, superconductivity, superfluidity, lasers, and surfaces.