Gapped commensurate antiferromagnetic response in a strongly underdoped model cuprate superconductor
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| Autores principales: | , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
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2024
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| author | Anderson, Zachary W. Tang, Yang Nagarajan, Vikram Chan, Mun K. Dorow, Chelsey J. Yu, Guichuan Abernathy, Douglas L. Christianson, Andrew D. Mangin-Thro, Lucile Steffens, Paul Sterling, Tyler Reznik, Dmitry Bounoua, Dalila Sidis, Yvan Bourges, Philippe Greven, Martin |
| author_facet | Anderson, Zachary W. Tang, Yang Nagarajan, Vikram Chan, Mun K. Dorow, Chelsey J. Yu, Guichuan Abernathy, Douglas L. Christianson, Andrew D. Mangin-Thro, Lucile Steffens, Paul Sterling, Tyler Reznik, Dmitry Bounoua, Dalila Sidis, Yvan Bourges, Philippe Greven, Martin |
| contents | It is a distinct possibility that spin fluctuations are the pairing interactions in a wide range of unconventional superconductors. In the case of the high-transition-temperature (high-$T_c$) cuprates, in which superconductivity emerges upon doping an antiferromagnetic Mott-insulating state, spin correlations might furthermore drive unusual pseudogap phenomena. Here we use polarized and unpolarized magnetic neutron scattering to study the simple tetragonal cuprate $\mathrm{HgBa}_{2}\mathrm{CuO}_{4+δ}$ at very low doping ($T_c \approx 55$ K, hole concentration $p \approx 0.064$). In stark contrast to prior results for other underdoped cuprates, we find no evidence of incommensurate spin-density-wave, charge-spin stripe, or $q = 0$ magnetic order. Instead, the antiferromagnetic response in both the superconducting and pseudogap states is gapped below $Δ_\mathrm{AF} \approx 6$ meV, commensurate over a wide energy range, and disperses above about 55 meV. Given the documented model nature of $\mathrm{HgBa}_{2}\mathrm{CuO}_{4+δ}$, which exhibits high structural symmetry and minimal point disorder effects, we conclude that the observed behavior signifies the unmasked response of the quintessential $\mathrm{CuO}_{2}$ planes near the Mott-insulating state. These results for $\mathrm{HgBa}_{2}\mathrm{CuO}_{4+δ}$ can therefore be expected to serve as a benchmark for a refined theoretical understanding of the cuprates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_03524 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Gapped commensurate antiferromagnetic response in a strongly underdoped model cuprate superconductor Anderson, Zachary W. Tang, Yang Nagarajan, Vikram Chan, Mun K. Dorow, Chelsey J. Yu, Guichuan Abernathy, Douglas L. Christianson, Andrew D. Mangin-Thro, Lucile Steffens, Paul Sterling, Tyler Reznik, Dmitry Bounoua, Dalila Sidis, Yvan Bourges, Philippe Greven, Martin Superconductivity Strongly Correlated Electrons It is a distinct possibility that spin fluctuations are the pairing interactions in a wide range of unconventional superconductors. In the case of the high-transition-temperature (high-$T_c$) cuprates, in which superconductivity emerges upon doping an antiferromagnetic Mott-insulating state, spin correlations might furthermore drive unusual pseudogap phenomena. Here we use polarized and unpolarized magnetic neutron scattering to study the simple tetragonal cuprate $\mathrm{HgBa}_{2}\mathrm{CuO}_{4+δ}$ at very low doping ($T_c \approx 55$ K, hole concentration $p \approx 0.064$). In stark contrast to prior results for other underdoped cuprates, we find no evidence of incommensurate spin-density-wave, charge-spin stripe, or $q = 0$ magnetic order. Instead, the antiferromagnetic response in both the superconducting and pseudogap states is gapped below $Δ_\mathrm{AF} \approx 6$ meV, commensurate over a wide energy range, and disperses above about 55 meV. Given the documented model nature of $\mathrm{HgBa}_{2}\mathrm{CuO}_{4+δ}$, which exhibits high structural symmetry and minimal point disorder effects, we conclude that the observed behavior signifies the unmasked response of the quintessential $\mathrm{CuO}_{2}$ planes near the Mott-insulating state. These results for $\mathrm{HgBa}_{2}\mathrm{CuO}_{4+δ}$ can therefore be expected to serve as a benchmark for a refined theoretical understanding of the cuprates. |
| title | Gapped commensurate antiferromagnetic response in a strongly underdoped model cuprate superconductor |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2412.03524 |