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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2406.18209 |
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| _version_ | 1866911933680058368 |
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| author | Tikhanovskii, A. Yu. Ivanov, V. Yu. Kuzmenko, A. M. Stunault, A. Fabelo, O. Ressouche, E. Simonet, V. Ballou, R. Kibalin, I. A. Pimenov, A. Mukhin, A. A. Constable, E. |
| author_facet | Tikhanovskii, A. Yu. Ivanov, V. Yu. Kuzmenko, A. M. Stunault, A. Fabelo, O. Ressouche, E. Simonet, V. Ballou, R. Kibalin, I. A. Pimenov, A. Mukhin, A. A. Constable, E. |
| contents | The magnetic properties of Ho-doped langasites (La:Ho)$_3$Ga$_5$SiO$_{14}$ are dominated by the Ising-like magnetic moments of the Ho$^{3+}$ ions. In their saturated regime, the induced magnetic state breaks both time and space inversion symmetries, leading to a novel linear magnetoelectric effect. However, due to distortions induced by a shared Ga/Si occupancy of the 2d sites, resolving the microscopic nature of the magnetic configuration remains a difficult task. Here we combine polarized neutron diffraction and angular dependent magnetization experiments to determine the local distortions of the Ho$^{3+}$ magnetic moments in doped langasites (La$_{1-x}$Ho$_x$)$_3$Ga$_5$SiO$_{14}$ with $x \approx 0.015$ and $x \approx 0.045$. We propose a model for a field-induced magnetic configuration with arbitrary orientations of the local Ising axis of Ho$^{3+}$ in distorted positions. The operations of broken local $C_2$ symmetry and rotations around the trigonal $C_3$ axis connect different sites, restoring the global P321 symmetry of the crystal and simplifying the description of the magnetic properties. The superposition of two distorted Ho$^{3+}$ positions connected by $C_2$ symmetry determines the local magnetic susceptibility tensor, which no longer appears Ising-like at low fields. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_18209 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Resolving the local distortions of Ising-like moments in magnetoelectric Ho-doped langasite Tikhanovskii, A. Yu. Ivanov, V. Yu. Kuzmenko, A. M. Stunault, A. Fabelo, O. Ressouche, E. Simonet, V. Ballou, R. Kibalin, I. A. Pimenov, A. Mukhin, A. A. Constable, E. Materials Science The magnetic properties of Ho-doped langasites (La:Ho)$_3$Ga$_5$SiO$_{14}$ are dominated by the Ising-like magnetic moments of the Ho$^{3+}$ ions. In their saturated regime, the induced magnetic state breaks both time and space inversion symmetries, leading to a novel linear magnetoelectric effect. However, due to distortions induced by a shared Ga/Si occupancy of the 2d sites, resolving the microscopic nature of the magnetic configuration remains a difficult task. Here we combine polarized neutron diffraction and angular dependent magnetization experiments to determine the local distortions of the Ho$^{3+}$ magnetic moments in doped langasites (La$_{1-x}$Ho$_x$)$_3$Ga$_5$SiO$_{14}$ with $x \approx 0.015$ and $x \approx 0.045$. We propose a model for a field-induced magnetic configuration with arbitrary orientations of the local Ising axis of Ho$^{3+}$ in distorted positions. The operations of broken local $C_2$ symmetry and rotations around the trigonal $C_3$ axis connect different sites, restoring the global P321 symmetry of the crystal and simplifying the description of the magnetic properties. The superposition of two distorted Ho$^{3+}$ positions connected by $C_2$ symmetry determines the local magnetic susceptibility tensor, which no longer appears Ising-like at low fields. |
| title | Resolving the local distortions of Ising-like moments in magnetoelectric Ho-doped langasite |
| topic | Materials Science |
| url | https://arxiv.org/abs/2406.18209 |