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<p>The present work investigated the mixed crystal structure of multiferroic material Yb<sub>0.9</sub>Sr<sub>0.1</sub>MnO<sub>3</sub> and studied the influence of nanocrystalline size on its physical properties. The X-ray and neutron diffraction analysis of Yb<sub>0.9</sub>Sr<sub>0.1</sub>MnO<sub>3</sub> reveals a mixed orthorhombic/hexagonal phase. The average crystallite size observed from XRD and SEM analysis is ~ 70–85&#xa0;nm. The orthorhombic phase, characterized by a space group <i>Pnma</i> (No. 62), decreases from 45 to 5% with heat treatment<i>,</i> while quantity of the hexagonal phase characterized by a space group <i>P6</i><sub><i>3</i></sub><i>cm</i> (No.185) increases accordingly. It is found that the lattice parameters of hexagonal crystal system at room temperature are <i>a</i> = <i>b</i> = 6.06479Å, <i>c</i> = 11.42647Å, γ = 120° and the orthorhombic one are <i>a</i> = 5.390Å, <i>b</i> = 7.5440Å and <i>c</i> = 5.430Å. Two antiferromagnetic ordering temperature points of Yb<sub>0.9</sub>Sr<sub>0.1</sub>MnO<sub>3</sub> are observed near 87&#xa0;K and 120&#xa0;K, attributed to <i>C</i>-type antiferromagnetic ordering and&#xa0;<i>Γ2</i>-type antiferromagnetic ordering, respectively. The magnetic moment of the <i>Γ2</i> antiferromagnetic phase was deduced to be 3.4μ<sub>B</sub>/Mn at 2.5 K. The magnetic moment of the <i>C</i>-type antiferromagnetic phase was found to be 1.2μ<sub>B</sub>/Mn at 2.5 K. A theoretical model describing the magnetization as a function of crystal structure and temperature, based on the Monte Carlo simulation is presented. The internal energy was calculated based on the Ising model, a crucial part of the methodology<b>.</b>&#xa0;The magnetization behavior exhibits a first-order phase transition at low <i>H</i> while a second-order phase transition at high <i>H</i>. Theoretical&#xa0;calculations&#xa0;not only&#xa0;confirmed&#xa0;but also validated&#xa0;the experimental results and their interpretation, providing a solid foundation for the study.Please confirm if the author names are presented accurately and in the correct sequence (given name, middle name/initial, family name). Author 1 Given name: [specify authors given name] Last name [specify authors last name]. Also, kindly confirm the details in the metadata are correct.Ok</p>

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Low temperature study of the complex magnetic order in Yb0.9Sr0.1MnO3 using neutron diffraction

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  • 发表日期：

    2025年7月15日

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  • I. A. Abdel-Latif,
  • A. I. Kurbakov,
  • Sh. I. Hussein,
  • Mahrous R. Ahmed

摘要

The present work investigated the mixed crystal structure of multiferroic material Yb0.9Sr0.1MnO3 and studied the influence of nanocrystalline size on its physical properties. The X-ray and neutron diffraction analysis of Yb0.9Sr0.1MnO3 reveals a mixed orthorhombic/hexagonal phase. The average crystallite size observed from XRD and SEM analysis is ~ 70–85 nm. The orthorhombic phase, characterized by a space group Pnma (No. 62), decreases from 45 to 5% with heat treatment, while quantity of the hexagonal phase characterized by a space group P63cm (No.185) increases accordingly. It is found that the lattice parameters of hexagonal crystal system at room temperature are a = b = 6.06479Å, c = 11.42647Å, γ = 120° and the orthorhombic one are a = 5.390Å, b = 7.5440Å and c = 5.430Å. Two antiferromagnetic ordering temperature points of Yb0.9Sr0.1MnO3 are observed near 87 K and 120 K, attributed to C-type antiferromagnetic ordering and Γ2-type antiferromagnetic ordering, respectively. The magnetic moment of the Γ2 antiferromagnetic phase was deduced to be 3.4μB/Mn at 2.5 K. The magnetic moment of the C-type antiferromagnetic phase was found to be 1.2μB/Mn at 2.5 K. A theoretical model describing the magnetization as a function of crystal structure and temperature, based on the Monte Carlo simulation is presented. The internal energy was calculated based on the Ising model, a crucial part of the methodology. The magnetization behavior exhibits a first-order phase transition at low H while a second-order phase transition at high H. Theoretical calculations not only confirmed but also validated the experimental results and their interpretation, providing a solid foundation for the study.Please confirm if the author names are presented accurately and in the correct sequence (given name, middle name/initial, family name). Author 1 Given name: [specify authors given name] Last name [specify authors last name]. Also, kindly confirm the details in the metadata are correct.Ok