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Jumplike Magnetic Disordering Processes Stimulated by a Magnetic Field in Systems with Structural Instability

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Abstract

A theoretical analysis of the features of first-order structural and magnetostructural transitions in magnetocaloric helimagnetic alloys of the Mn1 – xCrxNiGe system is performed. The observed structural transitions of the displacement type hex(P63/mmc) ↔ orth(Pnma) are described using the local soft mode model in the approximation of a displaced harmonic oscillator. In the absence of a magnetic field, the emergence of a helimagnetic order as a structurally induced second-order transition is described within the Heisenberg model with allowance for the dependence of the exchange integrals on the structural order parameters and elastic strains. In the presence of a magnetic field, it was found that the mutual approach of the characteristic temperatures for the helimagnetic state (HM(Pnma)) and the lability temperatures of the hexagonal paramagnetic state (PM(P63/mmc)), due to the action of the magnetic field, leads to the appearance of previously unexplored peripheral first-order magnetostructural transitions with insignificant magnetization jumps, increasing with increasing magnetic induction field. In this case, as the pressure increases to 4 kbar with a constant magnetic induction field, the peripheral transitions are transformed into reversible first-order magnetostructural transitions and, at even higher pressures (10–14 kbar), into full-scale first-order magnetostructural transitions with magnetization jumps comparable with the maximum magnetization. Experimental baric studies of the temperature dependences of the magnetization in static magnetic fields with an induction up to 1 T and pressure up to 14 kbar confirm the theoretical results.

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Funding

This work was carried out within a state task and was supported in part by the Russian Foundation for Basic Research, grant no. 18-07-01320.

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Authors and Affiliations

  1. Donetsk Institute for Physics and Engineering Named after A.A. Galkin, 83114, Donetsk, Ukraine

    V. I. Val’kov, A. V. Golovchan & B. M. Todris

  2. Kotel’nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, 125009, Moscow, Russia

    V. V. Koledov

  3. SSPA Scientific–Practical Materials Research Center, National Academy of Sciences of Belarus, 220072, Minsk, Belarus

    V. I. Mitsiuk

Authors
  1. V. I. Val’kov
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  2. A. V. Golovchan
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  3. V. V. Koledov
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  4. B. M. Todris
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  5. V. I. Mitsiuk
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Corresponding author

Correspondence to V. I. Val’kov.

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The authors declare that they have no conflicts of interest.

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Translated by E. Chernokozhin

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Val’kov, V.I., Golovchan, A.V., Koledov, V.V. et al. Jumplike Magnetic Disordering Processes Stimulated by a Magnetic Field in Systems with Structural Instability. Phys. Solid State 62, 798–807 (2020). https://doi.org/10.1134/S1063783420050315

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  • DOI: https://doi.org/10.1134/S1063783420050315

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