Dirac Dispersions and Fermi Surface Nesting in LaCuSb$_{2}$
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
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2024
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| _version_ | 1866929741943013376 |
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| author | Rosmus, Marcin Olszowska, Natalia Bukowski, Zbigniew Piekarz, Przemysław Ptok, Andrzej Starowicz, Paweł |
| author_facet | Rosmus, Marcin Olszowska, Natalia Bukowski, Zbigniew Piekarz, Przemysław Ptok, Andrzej Starowicz, Paweł |
| contents | LaCuSb$_{2}$ is a superconductor with a transition temperature of about $T_\text{c} = 0.9$K and is a potential platform where Dirac fermions can be experimentally observed. In this paper, we report systematic high-resolution studies of its electronic structure using the angle-resolved photoemission spectroscopy (ARPES) technique supported by the DFT calculation. The Fermi surface consists of four branches, of which the two inner ones are more 3-dimensional and the theoretical calculations reproduce well the experiment. We observe several linear dispersions forming Dirac-like structures. The nodal lines are present in the system along ${\text{M}}$-${\text{A}}$ and ${\text{X}}$-${\text{R}}$ and Dirac crossings along ${\text{X}}$-${\text{R}}$ are observed by ARPES. Finally, the nesting between external Fermi surface pockets, which corresponds to charge density wave (CDW) modulation vector is enhanced in LaCuSb$_{2}$ as compared to LaAgSb$_{2}$, while CDW appears in the latter system. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_17737 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Dirac Dispersions and Fermi Surface Nesting in LaCuSb$_{2}$ Rosmus, Marcin Olszowska, Natalia Bukowski, Zbigniew Piekarz, Przemysław Ptok, Andrzej Starowicz, Paweł Materials Science Superconductivity LaCuSb$_{2}$ is a superconductor with a transition temperature of about $T_\text{c} = 0.9$K and is a potential platform where Dirac fermions can be experimentally observed. In this paper, we report systematic high-resolution studies of its electronic structure using the angle-resolved photoemission spectroscopy (ARPES) technique supported by the DFT calculation. The Fermi surface consists of four branches, of which the two inner ones are more 3-dimensional and the theoretical calculations reproduce well the experiment. We observe several linear dispersions forming Dirac-like structures. The nodal lines are present in the system along ${\text{M}}$-${\text{A}}$ and ${\text{X}}$-${\text{R}}$ and Dirac crossings along ${\text{X}}$-${\text{R}}$ are observed by ARPES. Finally, the nesting between external Fermi surface pockets, which corresponds to charge density wave (CDW) modulation vector is enhanced in LaCuSb$_{2}$ as compared to LaAgSb$_{2}$, while CDW appears in the latter system. |
| title | Dirac Dispersions and Fermi Surface Nesting in LaCuSb$_{2}$ |
| topic | Materials Science Superconductivity |
| url | https://arxiv.org/abs/2403.17737 |