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<p>The magnetic properties of Mn<sub>1–<i>x</i></sub>Rh<sub><i>x</i></sub>Si 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 <i>T</i><sub>C</sub> of compounds with 0.15 ≤ <i>x</i> ≤ 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 <i>T</i><sub>C</sub> increases with the rhodium content to <i>T</i><sub>C</sub>(<i>x</i>&#xa0;=&#xa0;0.15) = (244 ± 4) K, <i>T</i><sub>C</sub>(<i>x</i> = 0.4) = (299 ± 5) K, and <i>T</i><sub>C</sub>(<i>x</i> = 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.</p>

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

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月1日

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  • 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

摘要

The magnetic properties of Mn1–xRhxSi 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 TC 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 TC increases with the rhodium content to TC(x = 0.15) = (244 ± 4) K, TC(x = 0.4) = (299 ± 5) K, and TC(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.