Superconductivity suppression and bilayer decoupling in Pr substituted YBa$_2$Cu$_3$O$_{7-δ}$
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| Main Authors: | , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Yang, Jinming Jin, Zheting Wang, Siqi Moir, Camilla Xu, Mingyu Gunn, Brandon Du, Xian Kang, Zhibo Feng, Keke Hashimoto, Makoto Lu, Donghui McChesney, Jessica Sundermann, Martin Gretarsson, Hlynur Yang, Shize Xie, Wei-Wei Frano, Alex Ismail-Beigi, Sohrab Maple, M. Brian He, Yu |
| author_facet | Yang, Jinming Jin, Zheting Wang, Siqi Moir, Camilla Xu, Mingyu Gunn, Brandon Du, Xian Kang, Zhibo Feng, Keke Hashimoto, Makoto Lu, Donghui McChesney, Jessica Sundermann, Martin Gretarsson, Hlynur Yang, Shize Xie, Wei-Wei Frano, Alex Ismail-Beigi, Sohrab Maple, M. Brian He, Yu |
| contents | The mechanism behind superconductivity suppression induced by Pr substitutions in YBa$_2$Cu$_3$O$_{7-δ}$ (YBCO) has been a mystery since its discovery: in spite of being isovalent to Y$^{3+}$ with a small magnetic moment, it is the only rare-earth element that has a dramatic impact on YBCO's superconducting properties. Using angle-resolved photoemission spectroscopy (ARPES) and DFT+$U$ calculations, we uncover how Pr substitution modifies the low-energy electronic structure of YBCO. Contrary to the prevailing Fehrenbacher-Rice (FR) and Liechtenstein-Mazin (LM) models, the low energy electronic structure contains no signature of any $f$-electron hybridization or new states. Yet, strong electron doping is observed primarily on the antibonding Fermi surface. Meanwhile, we reveal major electronic structure modifications to Cu-derived states with increasing Pr substitution: a pronounced CuO$_2$ bilayer decoupling and an enhanced CuO chain hopping, implying indirect electron-release pathways beyond simple 4$f$ state ionization. Our results challenge the long-standing FR/LM mechanism and establish Pr substituted YBCO as a potential platform for exploring correlation-driven phenomena in coupled 1D-2D systems. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2510_15078 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Superconductivity suppression and bilayer decoupling in Pr substituted YBa$_2$Cu$_3$O$_{7-δ}$ Yang, Jinming Jin, Zheting Wang, Siqi Moir, Camilla Xu, Mingyu Gunn, Brandon Du, Xian Kang, Zhibo Feng, Keke Hashimoto, Makoto Lu, Donghui McChesney, Jessica Sundermann, Martin Gretarsson, Hlynur Yang, Shize Xie, Wei-Wei Frano, Alex Ismail-Beigi, Sohrab Maple, M. Brian He, Yu Superconductivity Strongly Correlated Electrons The mechanism behind superconductivity suppression induced by Pr substitutions in YBa$_2$Cu$_3$O$_{7-δ}$ (YBCO) has been a mystery since its discovery: in spite of being isovalent to Y$^{3+}$ with a small magnetic moment, it is the only rare-earth element that has a dramatic impact on YBCO's superconducting properties. Using angle-resolved photoemission spectroscopy (ARPES) and DFT+$U$ calculations, we uncover how Pr substitution modifies the low-energy electronic structure of YBCO. Contrary to the prevailing Fehrenbacher-Rice (FR) and Liechtenstein-Mazin (LM) models, the low energy electronic structure contains no signature of any $f$-electron hybridization or new states. Yet, strong electron doping is observed primarily on the antibonding Fermi surface. Meanwhile, we reveal major electronic structure modifications to Cu-derived states with increasing Pr substitution: a pronounced CuO$_2$ bilayer decoupling and an enhanced CuO chain hopping, implying indirect electron-release pathways beyond simple 4$f$ state ionization. Our results challenge the long-standing FR/LM mechanism and establish Pr substituted YBCO as a potential platform for exploring correlation-driven phenomena in coupled 1D-2D systems. |
| title | Superconductivity suppression and bilayer decoupling in Pr substituted YBa$_2$Cu$_3$O$_{7-δ}$ |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2510.15078 |