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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/2408.00401 |
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| _version_ | 1866912694340157440 |
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| author | Naamneh, Muntaser Paris, Eugenio McNally, Daniel Tseng, Yi Pudelko, Wojciech R. Gawryluk, Dariusz J. Shamblin, J. OQuinn, Eric Cohen-Stead, Benjamin Shi, Ming Radovic, Milan Lang, M. Schmitt, Thorsten Johnston, Steven Plumb, Nicholas C. |
| author_facet | Naamneh, Muntaser Paris, Eugenio McNally, Daniel Tseng, Yi Pudelko, Wojciech R. Gawryluk, Dariusz J. Shamblin, J. OQuinn, Eric Cohen-Stead, Benjamin Shi, Ming Radovic, Milan Lang, M. Schmitt, Thorsten Johnston, Steven Plumb, Nicholas C. |
| contents | Bipolaronic superconductivity is an exotic pairing mechanism proposed for materials like Ba$_{1-x}$K$_x$BiO$_3$ (BKBO); however, conclusive experimental evidence for a (bi)polaron metallic state in this material remains elusive. Here, we combine resonant inelastic x-ray and neutron total scattering techniques with advanced modelling to study the local lattice distortions, electronic structure, and electron-phonon coupling ($e$-ph) in BKBO as a function of doping. Data for the parent compound ($x = 0$) indicates that the electronic gap opens in predominantly oxygen-derived states strongly coupled to a long-range ordered breathing distortion of the oxygen sublattice. Upon doping, short-range breathing distortions and sizable ($e$-ph) coupling persist into the superconducting regime ($x = 0.4$). Comparisons with exact diagonalization and determinant quantum Monte Carlo calculations further support this conclusion. Our results provide compelling evidence that BKBO's metallic phase hosts a liquid of small (bi)polarons derived from local breathing distortions of the lattice, with implications for understanding the low-temperature superconducting instability |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_00401 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Persistence of small polarons into the superconducting phase of Ba$_{1-x}$K$_x$BiO$_3$ Naamneh, Muntaser Paris, Eugenio McNally, Daniel Tseng, Yi Pudelko, Wojciech R. Gawryluk, Dariusz J. Shamblin, J. OQuinn, Eric Cohen-Stead, Benjamin Shi, Ming Radovic, Milan Lang, M. Schmitt, Thorsten Johnston, Steven Plumb, Nicholas C. Superconductivity Bipolaronic superconductivity is an exotic pairing mechanism proposed for materials like Ba$_{1-x}$K$_x$BiO$_3$ (BKBO); however, conclusive experimental evidence for a (bi)polaron metallic state in this material remains elusive. Here, we combine resonant inelastic x-ray and neutron total scattering techniques with advanced modelling to study the local lattice distortions, electronic structure, and electron-phonon coupling ($e$-ph) in BKBO as a function of doping. Data for the parent compound ($x = 0$) indicates that the electronic gap opens in predominantly oxygen-derived states strongly coupled to a long-range ordered breathing distortion of the oxygen sublattice. Upon doping, short-range breathing distortions and sizable ($e$-ph) coupling persist into the superconducting regime ($x = 0.4$). Comparisons with exact diagonalization and determinant quantum Monte Carlo calculations further support this conclusion. Our results provide compelling evidence that BKBO's metallic phase hosts a liquid of small (bi)polarons derived from local breathing distortions of the lattice, with implications for understanding the low-temperature superconducting instability |
| title | Persistence of small polarons into the superconducting phase of Ba$_{1-x}$K$_x$BiO$_3$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2408.00401 |