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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2412.17194 |
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| _version_ | 1866915075838705664 |
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| author | Ikenobe, Toshiya Yamada, Takahiro Yamaura, Jun-ichi Oguchi, Tamio Okuma, Ryutaro Hirai, Daigorou Sagayama, Hajime Okamoto, Yoshihiko Hiroi, Zenji |
| author_facet | Ikenobe, Toshiya Yamada, Takahiro Yamaura, Jun-ichi Oguchi, Tamio Okuma, Ryutaro Hirai, Daigorou Sagayama, Hajime Okamoto, Yoshihiko Hiroi, Zenji |
| contents | Compounds with the anti-PbFCl structure exhibit a variety of electronic instabilities and intriguing physical properties. NaAlSi and NaAlGe are similar topological nodal-line semimetals, but they have distinct properties. NaAlSi is a superconductor at 6.8 K, whereas NaAlGe is an insulator with a pseudogap of approximately 100 K. Using the potassium-indium flux method, we succeeded in synthesizing a single crystal of KAlGe, a new anti-PbFCl compound. First principles electronic structure calculations reveal that KAlGe is isoelectronic with NaAlSi and NaAlGe. KAlGe undergoes a metal-to-metal transition at 89 K and exhibits no superconductivity above 1.8 K. The low temperature phase has significantly lower carrier density and extremely high mobility, similar to Dirac electron systems. Furthermore, X-ray diffraction experiments show a structural change that breaks the fourfold symmetry during the phase transition. Electron-phonon interactions may be responsible for superconductivity in NaAlSi, whereas excitonic electron-hole interactions are thought to play an important role in KAlGe and possibly NaAlGe. Our findings demonstrate that fascinating physics lies within the compound family. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_17194 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Topological Semimetal KAlGe with Novel Electronic Instability Ikenobe, Toshiya Yamada, Takahiro Yamaura, Jun-ichi Oguchi, Tamio Okuma, Ryutaro Hirai, Daigorou Sagayama, Hajime Okamoto, Yoshihiko Hiroi, Zenji Strongly Correlated Electrons Compounds with the anti-PbFCl structure exhibit a variety of electronic instabilities and intriguing physical properties. NaAlSi and NaAlGe are similar topological nodal-line semimetals, but they have distinct properties. NaAlSi is a superconductor at 6.8 K, whereas NaAlGe is an insulator with a pseudogap of approximately 100 K. Using the potassium-indium flux method, we succeeded in synthesizing a single crystal of KAlGe, a new anti-PbFCl compound. First principles electronic structure calculations reveal that KAlGe is isoelectronic with NaAlSi and NaAlGe. KAlGe undergoes a metal-to-metal transition at 89 K and exhibits no superconductivity above 1.8 K. The low temperature phase has significantly lower carrier density and extremely high mobility, similar to Dirac electron systems. Furthermore, X-ray diffraction experiments show a structural change that breaks the fourfold symmetry during the phase transition. Electron-phonon interactions may be responsible for superconductivity in NaAlSi, whereas excitonic electron-hole interactions are thought to play an important role in KAlGe and possibly NaAlGe. Our findings demonstrate that fascinating physics lies within the compound family. |
| title | Topological Semimetal KAlGe with Novel Electronic Instability |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2412.17194 |