Magnetism in EuAlSi and the Eu_{1−x}Sr_{x}AlSi solid solution
The magnetic properties of EuAlSi, a compound comprising a honeycomb lattice of Al/Si atoms and a triangular lattice of Eu atoms, are presented. By means of single-crystal x-ray diffraction, we find that EuAlSi crystallizes in an AlB_{2}-type structure with space group P6/mmm and unit cell parameter...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2025-08-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/69sn-hpxm |
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| Summary: | The magnetic properties of EuAlSi, a compound comprising a honeycomb lattice of Al/Si atoms and a triangular lattice of Eu atoms, are presented. By means of single-crystal x-ray diffraction, we find that EuAlSi crystallizes in an AlB_{2}-type structure with space group P6/mmm and unit cell parameters a=4.2229(10)Å and c=4.5268(12)Å. Our magnetic measurements indicate that EuAlSi is a soft ferromagnetic material with T_{Curie}=25.8K. The susceptibility follows the Curie-Weiss law at high temperatures, which allowed us to determine the paramagnetic Curie temperature θ_{P}=36.2(1)K and an effective magnetic moment μ_{eff}=8.07(1)µ_{B}/Eu. This value is in agreement with the theoretical value of 7.9µ_{B} for Eu^{2+} free ion. Moreover, we have prepared the Eu_{1−x}Sr_{x}AlSi solid solution, where the atoms in the triangular lattice were systematically exchanged, in order to study the evolution of the collective quantum properties from the ferromagnetic EuAlSi toward the superconducting SrAlSi. Across the Eu_{1−x}Sr_{x}AlSi solid solution, the unit cell parameters change linearly, following Vegard’s law, and making the system reliable for studying composition dependence of the interplay between the crystal structure and physical properties. As the Sr content increases, i.e., x increases, we note a consistent reduction of μ_{eff} and T_{Curie}. Long-range magnetic order in Eu_{1−x}Sr_{x}AlSi persists up to x=0.95, whereas superconductivity is only observed for samples with x>0.97. |
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| ISSN: | 2643-1564 |