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

IF 1.3 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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非中心对称磁体Mn1 - xRhxSi的居里温度升高至室温

研究了在压力为8gpa，温度为1500 ~ 1770 K的条件下合成的非中心对称结构的Mn1-xRhxSi固溶体B20在2 ~ 300 K的宽温度范围内，在高达9 t的磁场条件下的磁性能，发现0.15≤x≤0.8的化合物的居里温度TC比纯螺旋磁体MnSi的居里温度异常提高了8.4 ~ 11.5倍。居里温度TC随铑含量的增加而升高，分别为TC(x = 0.15) =(244±4)K、TC(x = 0.4) =(299±5)K和TC(x = 0.8) =(334±6)K。在无序的铁磁Griffiths相中出现了高达室温的高磁转变温度，这可能是由于磁相互作用增强的自旋涨落机制所致。

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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.