The first-order structural phase transition at low-temperature in GaPt$_{5}$P and its rapid enhancement with pressure
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arXiv
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| Auteurs principaux: | , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866914830700511232 |
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| author | Sapkota, A. Slade, T. J. Huyan, S. Nepal, N. K. Wilde, J. M. Furukawa, N. Laupidus, S. H. Wang, L. -L. Bud'ko, S. L. Canfield, P. C. |
| author_facet | Sapkota, A. Slade, T. J. Huyan, S. Nepal, N. K. Wilde, J. M. Furukawa, N. Laupidus, S. H. Wang, L. -L. Bud'ko, S. L. Canfield, P. C. |
| contents | Single crystals of XPt$_{5}$P (X = Al, Ga, and In) were grown from a Pt-P solution at high temperatures, and ambient-pressure measurements of temperature-dependent magnetization, resistivity, and X-ray diffraction were made. Also, the ambient-pressure Hall resistivity and temperature-dependent resistance under pressure were measured on GaPt$_{5}$P. All three compounds have tetragonal $P4/mmm$ crystal structure at room-temperature with metallic transport and weak diamagnetism over the $2-300$~K temperature range. Surprisingly, at ambient pressure, both the transport and magnetization measurements on GaPt$_{5}$P show a step-like feature in $70-90$~K region suggesting a possible structural phase transition, and no such features were observed in (Al/In)Pt$_{5}$P. Both the hysteretic nature and sharpness of the feature suggest the first-order transition, and single-crystal X-ray diffraction measurements provided further details of the structural transition with a crystal symmetry likely different than $P4/mmm$ below transition. The transition is characterized by anisotropic changes in the lattice parameters, a volume collapse, and satellite peaks at two distinct wave-vectors. Density functional theory calculations present phonon softening as a possible driving mechanism. Additionally, the structural transition temperature increases rapidly with increasing pressure, reaching room temperature by $\sim 2.2$~GPa, highlighting the high degree of pressure sensitivity and fragile nature of GaPt$_{5}$P room-temperature structure. Although the volume collapse and extreme pressure sensitivity suggest chemical pressure should drive a similar structural change in AlPt$_{5}$P, with smaller unit cell dimensions and volume, its structure is found to be $P4/mmm$ as well. Overall, GaPt$_{5}$P stands out as a sole member of the 1-5-1 family of compounds with a temperature-driven structural change. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_06291 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The first-order structural phase transition at low-temperature in GaPt$_{5}$P and its rapid enhancement with pressure Sapkota, A. Slade, T. J. Huyan, S. Nepal, N. K. Wilde, J. M. Furukawa, N. Laupidus, S. H. Wang, L. -L. Bud'ko, S. L. Canfield, P. C. Materials Science Single crystals of XPt$_{5}$P (X = Al, Ga, and In) were grown from a Pt-P solution at high temperatures, and ambient-pressure measurements of temperature-dependent magnetization, resistivity, and X-ray diffraction were made. Also, the ambient-pressure Hall resistivity and temperature-dependent resistance under pressure were measured on GaPt$_{5}$P. All three compounds have tetragonal $P4/mmm$ crystal structure at room-temperature with metallic transport and weak diamagnetism over the $2-300$~K temperature range. Surprisingly, at ambient pressure, both the transport and magnetization measurements on GaPt$_{5}$P show a step-like feature in $70-90$~K region suggesting a possible structural phase transition, and no such features were observed in (Al/In)Pt$_{5}$P. Both the hysteretic nature and sharpness of the feature suggest the first-order transition, and single-crystal X-ray diffraction measurements provided further details of the structural transition with a crystal symmetry likely different than $P4/mmm$ below transition. The transition is characterized by anisotropic changes in the lattice parameters, a volume collapse, and satellite peaks at two distinct wave-vectors. Density functional theory calculations present phonon softening as a possible driving mechanism. Additionally, the structural transition temperature increases rapidly with increasing pressure, reaching room temperature by $\sim 2.2$~GPa, highlighting the high degree of pressure sensitivity and fragile nature of GaPt$_{5}$P room-temperature structure. Although the volume collapse and extreme pressure sensitivity suggest chemical pressure should drive a similar structural change in AlPt$_{5}$P, with smaller unit cell dimensions and volume, its structure is found to be $P4/mmm$ as well. Overall, GaPt$_{5}$P stands out as a sole member of the 1-5-1 family of compounds with a temperature-driven structural change. |
| title | The first-order structural phase transition at low-temperature in GaPt$_{5}$P and its rapid enhancement with pressure |
| topic | Materials Science |
| url | https://arxiv.org/abs/2406.06291 |