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Abstract <p>We have investigated the structure and magnetic properties of La<sub>1 – <i>x</i></sub>Er<sub><i>x</i></sub>Mn<sub>2</sub>Si<sub>2</sub> (0 ≤ <i>х</i> ≤ 1). The compounds crystallize into the tetragonal ThCr<sub>2</sub>Si<sub>2</sub>-type structure in which the Mn and Er ions form separate magnetic layers. The lattice parameters and the volume of the unit cell gradually decrease with increasing <i>x</i>. We have found interlayer ferromagnetic–antiferromagnetic (FM–AFM) transition and revealed a separation into two magnetic phases, FM and AFM, between <i>x</i> = 0.2 and 0.4. Our magnetization measurements at low temperature on quasi-single crystals show that, with increasing <i>x</i>, the total magnetization reorients from the <i>c</i>-axis to the basal plane. The magnetocaloric effect is estimated from the temperature dependences of&#xa0;magnetization. The maximum magnetic entropy change value ∆<i>S</i><sub>M</sub> = –10.2 J kg<sup>–1</sup> K<sup>–1</sup> is found for La<sub>0.2</sub>Er<sub>0.8</sub>Mn<sub>2</sub>Si<sub>2</sub> at 7.5 K in magnetic fields 0–2 T applied in the basal plane of the crystal. In order to describe the field dependences of magnetization we use a model of three magnetic sublattices coupled by negative intersublattice exchange interactions. The model allows us to explain both temperature and concentration variations in the magnetization curves of La<sub>1 – <i>x</i></sub>Er<sub><i>x</i></sub>Mn<sub>2</sub>Si<sub>2</sub> for <i>x</i> ≥ 0.4.</p>

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Anisotropy of Magnetic and Magnetothermal Properties of La1 – xErxMn2Si2

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • N. V. Mushnikov,
  • E. G. Gerasimov,
  • P. B. Terentev,
  • A. M. Bartashevich,
  • V. S. Gaviko,
  • D. I. Gorbunov

摘要

Abstract

We have investigated the structure and magnetic properties of La1 – xErxMn2Si2 (0 ≤ х ≤ 1). The compounds crystallize into the tetragonal ThCr2Si2-type structure in which the Mn and Er ions form separate magnetic layers. The lattice parameters and the volume of the unit cell gradually decrease with increasing x. We have found interlayer ferromagnetic–antiferromagnetic (FM–AFM) transition and revealed a separation into two magnetic phases, FM and AFM, between x = 0.2 and 0.4. Our magnetization measurements at low temperature on quasi-single crystals show that, with increasing x, the total magnetization reorients from the c-axis to the basal plane. The magnetocaloric effect is estimated from the temperature dependences of magnetization. The maximum magnetic entropy change value ∆SM = –10.2 J kg–1 K–1 is found for La0.2Er0.8Mn2Si2 at 7.5 K in magnetic fields 0–2 T applied in the basal plane of the crystal. In order to describe the field dependences of magnetization we use a model of three magnetic sublattices coupled by negative intersublattice exchange interactions. The model allows us to explain both temperature and concentration variations in the magnetization curves of La1 – xErxMn2Si2 for x ≥ 0.4.