Hund's coupling assisted orbital-selective superconductivity in Ba1-xKxFe2As2
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866918156310675456 |
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| author | Corbae, Elena Zhang, Rong Li, Cong Kihou, Kunihiro Lee, Chul-Ho Hashimoto, Makoto Devereaux, Thomas Tjernberg, Oscar Babaev, Egor Lee, Dung-Hai Grinenko, Vadim Lu, Donghui Shen, Zhi-Xun |
| author_facet | Corbae, Elena Zhang, Rong Li, Cong Kihou, Kunihiro Lee, Chul-Ho Hashimoto, Makoto Devereaux, Thomas Tjernberg, Oscar Babaev, Egor Lee, Dung-Hai Grinenko, Vadim Lu, Donghui Shen, Zhi-Xun |
| contents | While the superconducting transition temperature of hole-doped Ba_{1-x}K_{x}Fe_{2}As_{2} decreases past optimal doping, superconductivity does not completely disappear even for the fully doped KFe_{2}As_{2} compound. In fact, superconductivity is robust through a Lifshitz transition where electron bands become hole-like around the zone corner at around x=0.7, thus challenging the conventional understanding of superconductivity in iron-based systems. High-resolution angle-resolved photoemission spectroscopy is used to investigate the superconducting gap structure, as well as the normal state electronic structure, around optimal doping and across the Lifshitz transition. Our findings reveal a largely orbital-dependent superconducting gap structure, where the more strongly correlated d_{xy} band has a vanishing superconducting gap at higher doping, aligning with the Hund's metal behavior observed in the normal state. Notably, the superconducting gap on the d_{xy} band disappears before the Lifshitz transition, suggesting that the Fermi surface topology may play a secondary role. We discuss how these results point to orbital-selective superconducting pairing and how strong correlations via Hund's coupling may shape superconducting gap structures in iron-based and other multiorbital superconductors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_06435 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Hund's coupling assisted orbital-selective superconductivity in Ba1-xKxFe2As2 Corbae, Elena Zhang, Rong Li, Cong Kihou, Kunihiro Lee, Chul-Ho Hashimoto, Makoto Devereaux, Thomas Tjernberg, Oscar Babaev, Egor Lee, Dung-Hai Grinenko, Vadim Lu, Donghui Shen, Zhi-Xun Superconductivity Strongly Correlated Electrons While the superconducting transition temperature of hole-doped Ba_{1-x}K_{x}Fe_{2}As_{2} decreases past optimal doping, superconductivity does not completely disappear even for the fully doped KFe_{2}As_{2} compound. In fact, superconductivity is robust through a Lifshitz transition where electron bands become hole-like around the zone corner at around x=0.7, thus challenging the conventional understanding of superconductivity in iron-based systems. High-resolution angle-resolved photoemission spectroscopy is used to investigate the superconducting gap structure, as well as the normal state electronic structure, around optimal doping and across the Lifshitz transition. Our findings reveal a largely orbital-dependent superconducting gap structure, where the more strongly correlated d_{xy} band has a vanishing superconducting gap at higher doping, aligning with the Hund's metal behavior observed in the normal state. Notably, the superconducting gap on the d_{xy} band disappears before the Lifshitz transition, suggesting that the Fermi surface topology may play a secondary role. We discuss how these results point to orbital-selective superconducting pairing and how strong correlations via Hund's coupling may shape superconducting gap structures in iron-based and other multiorbital superconductors. |
| title | Hund's coupling assisted orbital-selective superconductivity in Ba1-xKxFe2As2 |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2510.06435 |