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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2509.07589 |
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| _version_ | 1866912578449440768 |
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| author | Nixon, Rachel Zaremba, Nazar Adegboyega, Samuel A. Leithe-Jasper, Andreas Krnel, Mitja Prots, Yurii Burkhardt, Ulrich Sichelschmidt, Jörg Amidani, Lucia La Mattina, Fabio Shatruk, Michael Shengelaya, Alexander Brando, Manuel Svanidze, Eteri |
| author_facet | Nixon, Rachel Zaremba, Nazar Adegboyega, Samuel A. Leithe-Jasper, Andreas Krnel, Mitja Prots, Yurii Burkhardt, Ulrich Sichelschmidt, Jörg Amidani, Lucia La Mattina, Fabio Shatruk, Michael Shengelaya, Alexander Brando, Manuel Svanidze, Eteri |
| contents | In solid-state compounds, the valence of europium can sometimes be mixed -- which is especially favored in structures with several positions for the europium atoms. In this work, we study the Eu-based intermetallic noncentrosymmetric system Eu$_{10}$Hg$_{55}$ which has 65 atoms per unit cell and 4 distinct crystallographic positions for europium and 17 positions for mercury. Our detailed analysis of magnetism of large single crystals suggests that europium in Eu$_{10}$Hg$_{55}$ might be present in two valence states, resulting in a fragile magnetic ground state. Due to the cage-like structure with a large distance between the Eu atoms, those atoms are weakly ferromagnetically coupled and Eu$_{10}$Hg$_{55}$ orders at low temperatures, below $T_{1} = 5.5$ K, with a subsequent spin re-orientation at $T_{2} = 4.3$ K. There is no sign of magnetic frustration. Interestingly, the magnetic ordering of europium sub-lattices results in a magnetization pole reversal with a weak ferrimagnetic ground state. Additional magnetic phases can be induced by application of a modest external magnetic field. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_07589 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Unusual magnetic order in Eu$_{10}$Hg$_{55}$ Nixon, Rachel Zaremba, Nazar Adegboyega, Samuel A. Leithe-Jasper, Andreas Krnel, Mitja Prots, Yurii Burkhardt, Ulrich Sichelschmidt, Jörg Amidani, Lucia La Mattina, Fabio Shatruk, Michael Shengelaya, Alexander Brando, Manuel Svanidze, Eteri Materials Science Strongly Correlated Electrons In solid-state compounds, the valence of europium can sometimes be mixed -- which is especially favored in structures with several positions for the europium atoms. In this work, we study the Eu-based intermetallic noncentrosymmetric system Eu$_{10}$Hg$_{55}$ which has 65 atoms per unit cell and 4 distinct crystallographic positions for europium and 17 positions for mercury. Our detailed analysis of magnetism of large single crystals suggests that europium in Eu$_{10}$Hg$_{55}$ might be present in two valence states, resulting in a fragile magnetic ground state. Due to the cage-like structure with a large distance between the Eu atoms, those atoms are weakly ferromagnetically coupled and Eu$_{10}$Hg$_{55}$ orders at low temperatures, below $T_{1} = 5.5$ K, with a subsequent spin re-orientation at $T_{2} = 4.3$ K. There is no sign of magnetic frustration. Interestingly, the magnetic ordering of europium sub-lattices results in a magnetization pole reversal with a weak ferrimagnetic ground state. Additional magnetic phases can be induced by application of a modest external magnetic field. |
| title | Unusual magnetic order in Eu$_{10}$Hg$_{55}$ |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2509.07589 |