Evidence of rotational and tilting disorder of ReO6 octahedra in single crystals of a 5d1 double perovskite Ba2CaReO6
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
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2025
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| _version_ | 1866915388555526144 |
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| author | Nicholls, Alasdair Soh, Jian-Rui Yang, Yikai Bombardi, Alessandro Hirai, Daigorou Ronnow, Henrik M. Zivkovic, Ivica |
| author_facet | Nicholls, Alasdair Soh, Jian-Rui Yang, Yikai Bombardi, Alessandro Hirai, Daigorou Ronnow, Henrik M. Zivkovic, Ivica |
| contents | We present results of an experimental study on single crystals of a 5d1 double perovskite Ba2CaReO6. Magnetization measurements reveal a weak splitting between zero-field-cooled and field-cooled protocols below 12 K. At magnetic fields above 1 T the splitting is absent and the magnetic susceptibility is featureless. A detailed specific heat study in a wide temperature range and comprising different heat pulses did not reveal any indication of a thermodynamic phase transition. At low temperatures we do observe specific heat deviating from a phonon background, leading to a total electronic entropy release of ~Rln2. Resonant and non-resonant x-ray diffraction of characteristic Bragg peaks indicates a significant presence of disorder, potentially related to random tilts and rotations of rigid ReO6 octahedra. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_10107 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Evidence of rotational and tilting disorder of ReO6 octahedra in single crystals of a 5d1 double perovskite Ba2CaReO6 Nicholls, Alasdair Soh, Jian-Rui Yang, Yikai Bombardi, Alessandro Hirai, Daigorou Ronnow, Henrik M. Zivkovic, Ivica Strongly Correlated Electrons We present results of an experimental study on single crystals of a 5d1 double perovskite Ba2CaReO6. Magnetization measurements reveal a weak splitting between zero-field-cooled and field-cooled protocols below 12 K. At magnetic fields above 1 T the splitting is absent and the magnetic susceptibility is featureless. A detailed specific heat study in a wide temperature range and comprising different heat pulses did not reveal any indication of a thermodynamic phase transition. At low temperatures we do observe specific heat deviating from a phonon background, leading to a total electronic entropy release of ~Rln2. Resonant and non-resonant x-ray diffraction of characteristic Bragg peaks indicates a significant presence of disorder, potentially related to random tilts and rotations of rigid ReO6 octahedra. |
| title | Evidence of rotational and tilting disorder of ReO6 octahedra in single crystals of a 5d1 double perovskite Ba2CaReO6 |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2507.10107 |