Suppression of the valence transition in solution-grown single crystals of Eu$_2$Pt$_6$Al$_{15}$
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arXiv
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| Auteurs principaux: | , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909992382103552 |
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| author | Schmidt, Juan Ryan, Dominic H. Janka, Oliver Kösters, Jutta Mueller, Carsyn L. Sapkota, Aashish Penacchio, Rafaela F. S. Slade, Tyler J. Bud'ko, Sergey L. Canfield, Paul C. |
| author_facet | Schmidt, Juan Ryan, Dominic H. Janka, Oliver Kösters, Jutta Mueller, Carsyn L. Sapkota, Aashish Penacchio, Rafaela F. S. Slade, Tyler J. Bud'ko, Sergey L. Canfield, Paul C. |
| contents | The study of Eu intermetallic compounds has allowed the exploration of valence fluctuations and transitions in 4f electron systems. Recently, a Eu$_2$Pt$_6$Al$_{15}$ phase synthesized by arc-melting followed by a thermal treatment was reported [M. Radzieowski \textit{et al.}, J Am Chem Soc 140(28), 8950-8957 (2018)], which undergoes a transition upon cooling below 45~K that was interpreted as a valence transition from Eu$^{2+}$ to Eu$^{3+}$. In this paper, we present the discovery of another polymorph of Eu$_2$Pt$_6$Al$_{15}$ obtained by high temperature solution growth, which presents different physical properties than the arc-melted polycrystalline sample. Despite the similarities in crystal structure and chemical composition, the Eu valence transition is almost fully suppressed in the solution-grown crystals, allowing the moments associated with the Eu$^{2+}$ state to order antiferromagnetically at around 14~K. A detailed analysis of the crystal structure using single crystal X-ray diffraction reveals that, although the solution grown crystals are built from the same constituent layers as the arc-melted samples, these layers present a different stacking. The effect of different thermal treatments is also studied. Different anneal procedures did not result in significant changes in the intrinsic properties, and only by arc-melting and quenching the crystals we were able to convert them into the previously reported polymorph. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_14841 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Suppression of the valence transition in solution-grown single crystals of Eu$_2$Pt$_6$Al$_{15}$ Schmidt, Juan Ryan, Dominic H. Janka, Oliver Kösters, Jutta Mueller, Carsyn L. Sapkota, Aashish Penacchio, Rafaela F. S. Slade, Tyler J. Bud'ko, Sergey L. Canfield, Paul C. Materials Science The study of Eu intermetallic compounds has allowed the exploration of valence fluctuations and transitions in 4f electron systems. Recently, a Eu$_2$Pt$_6$Al$_{15}$ phase synthesized by arc-melting followed by a thermal treatment was reported [M. Radzieowski \textit{et al.}, J Am Chem Soc 140(28), 8950-8957 (2018)], which undergoes a transition upon cooling below 45~K that was interpreted as a valence transition from Eu$^{2+}$ to Eu$^{3+}$. In this paper, we present the discovery of another polymorph of Eu$_2$Pt$_6$Al$_{15}$ obtained by high temperature solution growth, which presents different physical properties than the arc-melted polycrystalline sample. Despite the similarities in crystal structure and chemical composition, the Eu valence transition is almost fully suppressed in the solution-grown crystals, allowing the moments associated with the Eu$^{2+}$ state to order antiferromagnetically at around 14~K. A detailed analysis of the crystal structure using single crystal X-ray diffraction reveals that, although the solution grown crystals are built from the same constituent layers as the arc-melted samples, these layers present a different stacking. The effect of different thermal treatments is also studied. Different anneal procedures did not result in significant changes in the intrinsic properties, and only by arc-melting and quenching the crystals we were able to convert them into the previously reported polymorph. |
| title | Suppression of the valence transition in solution-grown single crystals of Eu$_2$Pt$_6$Al$_{15}$ |
| topic | Materials Science |
| url | https://arxiv.org/abs/2508.14841 |