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| Autori principali: | , , , |
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| Natura: | Preprint |
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2025
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| Accesso online: | https://arxiv.org/abs/2511.04149 |
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| _version_ | 1866914140362113024 |
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| author | Jinwon, Jeong Bin, Chang Han-Jin, Noh Seongsu, Lee |
| author_facet | Jinwon, Jeong Bin, Chang Han-Jin, Noh Seongsu, Lee |
| contents | We have investigated the temperature dependence of the crystal structure of quasi-one-dimensional monoclinic BaIrO$_3$ using X-ray diffraction. Diffraction patterns were measured across a temperature range from 13 K to 300 K, with 5-degree steps, and Rietveld refinements were performed to extract the relevant lattice parameters. The resulting cell volumes exhibit a significant deviation from the Debye model predictions for lattice-specific heat within a reasonable range of the Debye temperature, Gr{ü}neisen parameter, and bulk modulus. This suggests an invar-like, unconventional thermal expansion behavior. The deviation begins near the weak ferromagnetic transition temperature, indicating a strong correlation with changes in the electronic and magnetic structure of monoclinic BaIrO$_3$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_04149 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Unconventional Thermal Expansion in quasi-one-dimensional monoclinic BaIrO$_3$ Jinwon, Jeong Bin, Chang Han-Jin, Noh Seongsu, Lee Materials Science We have investigated the temperature dependence of the crystal structure of quasi-one-dimensional monoclinic BaIrO$_3$ using X-ray diffraction. Diffraction patterns were measured across a temperature range from 13 K to 300 K, with 5-degree steps, and Rietveld refinements were performed to extract the relevant lattice parameters. The resulting cell volumes exhibit a significant deviation from the Debye model predictions for lattice-specific heat within a reasonable range of the Debye temperature, Gr{ü}neisen parameter, and bulk modulus. This suggests an invar-like, unconventional thermal expansion behavior. The deviation begins near the weak ferromagnetic transition temperature, indicating a strong correlation with changes in the electronic and magnetic structure of monoclinic BaIrO$_3$. |
| title | Unconventional Thermal Expansion in quasi-one-dimensional monoclinic BaIrO$_3$ |
| topic | Materials Science |
| url | https://arxiv.org/abs/2511.04149 |