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<p>The present work reports the detailed dc magnetization and <sup>57</sup>Fe Mössbauer measurements on magnetic germanate ErFeCuGe<sub>4</sub>O<sub>12</sub>, crystallizing in a tetragonal structure with space group <i>P4/nbm</i>. Our magnetization results demonstrate a new magnetic transition around 12&#xa0;K, along with the previously reported antiferromagnetic transition at 20&#xa0;K. The different magnetic structure above and below 12&#xa0;K is further verified by its metamagnetic aspects in the presence of an applied magnetic field. In addition, <sup>57</sup>Fe Mössbauer measurements at 5&#xa0;K show negative quadrupole shift values and the possible explanation is presented in terms of its spin structure as reported from neutron diffraction in the literature.</p>

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Magnetic Study of Mixed-Metal Germanate ErFeCuGe4O12

  • 期刊论文

  • 发表日期：

    2025年8月23日

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  • Shivani Kulasari,
  • Ayush Rana,
  • Rony Kohli,
  • R. Das,
  • V. Raghavendra Reddy,
  • Sanjay Kumar Upadhyay

摘要

The present work reports the detailed dc magnetization and 57Fe Mössbauer measurements on magnetic germanate ErFeCuGe4O12, crystallizing in a tetragonal structure with space group P4/nbm. Our magnetization results demonstrate a new magnetic transition around 12 K, along with the previously reported antiferromagnetic transition at 20 K. The different magnetic structure above and below 12 K is further verified by its metamagnetic aspects in the presence of an applied magnetic field. In addition, 57Fe Mössbauer measurements at 5 K show negative quadrupole shift values and the possible explanation is presented in terms of its spin structure as reported from neutron diffraction in the literature.