Experimental electronic structure of the mineral superconductor covellite CuS
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866909766793560064 |
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| author | Antezak, Alexandre Kato, Takemi Gonçalves, Pedro Rezende Fortuna, Franck Rosmus, Marcin Olszowska, Natalia Santander-Syro, Andrés Felipe Frantzeskakis, Emmanouil |
| author_facet | Antezak, Alexandre Kato, Takemi Gonçalves, Pedro Rezende Fortuna, Franck Rosmus, Marcin Olszowska, Natalia Santander-Syro, Andrés Felipe Frantzeskakis, Emmanouil |
| contents | Covellite (CuS) is the first known natural mineral superconductor. Despite its simple chemical formula, covellite exhibits a rich crystal structure at the origin of several remarkable properties. The ionic arrangement in CuS crystals leads to a mixed valence of Cu and a second-order structural transition at 55 K. Despite the abundance of structural studies and theoretical reports on its electronic structure, there are scarce references on its experimental band structure. By means of Angle Resolved PhotoEmission Spectroscopy (ARPES), we have probed the experimental electronic structure of covellite. We compare our results with the predictions of density-functional theory (DFT) calculations. Our experimental data are in remarkable agreement with the calculations, revealing subtle fingerprints of the structural phase transition, and confirming the quasi-2D nature of the electronic structure of CuS. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_02468 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Experimental electronic structure of the mineral superconductor covellite CuS Antezak, Alexandre Kato, Takemi Gonçalves, Pedro Rezende Fortuna, Franck Rosmus, Marcin Olszowska, Natalia Santander-Syro, Andrés Felipe Frantzeskakis, Emmanouil Materials Science Strongly Correlated Electrons Superconductivity Covellite (CuS) is the first known natural mineral superconductor. Despite its simple chemical formula, covellite exhibits a rich crystal structure at the origin of several remarkable properties. The ionic arrangement in CuS crystals leads to a mixed valence of Cu and a second-order structural transition at 55 K. Despite the abundance of structural studies and theoretical reports on its electronic structure, there are scarce references on its experimental band structure. By means of Angle Resolved PhotoEmission Spectroscopy (ARPES), we have probed the experimental electronic structure of covellite. We compare our results with the predictions of density-functional theory (DFT) calculations. Our experimental data are in remarkable agreement with the calculations, revealing subtle fingerprints of the structural phase transition, and confirming the quasi-2D nature of the electronic structure of CuS. |
| title | Experimental electronic structure of the mineral superconductor covellite CuS |
| topic | Materials Science Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2509.02468 |