Strain-induced structural change and nearly-commensurate diffuse scattering in the model high-temperature superconductor HgBa$_2$CuO$_{4+δ}$
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arXiv
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| Autori principali: | , , , , , , , , , , , |
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| Natura: | Preprint |
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2025
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| _version_ | 1866914501278826496 |
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| author | Ye, Mai Hong, Wenshan Lacmann, Tom Frachet, Mehdi Vinograd, Igor Garbarino, Gaston Souliou, Sofia-Michaela Merz, Michael Heid, Rolf Haghighirad, Amir-Abbas Li, Yuan Tacon, Matthieu Le |
| author_facet | Ye, Mai Hong, Wenshan Lacmann, Tom Frachet, Mehdi Vinograd, Igor Garbarino, Gaston Souliou, Sofia-Michaela Merz, Michael Heid, Rolf Haghighirad, Amir-Abbas Li, Yuan Tacon, Matthieu Le |
| contents | We investigate the strain response of underdoped HgBa$_2$CuO$_{4+δ}$ (Hg1201), by synchrotron X-ray diffraction and corresponding simulations of thermal diffuse scattering. The compression in the crystallographic $a$ direction leads to relatively small expansion in the $b$ and $c$ directions, with Poisson ratios $ν_{ba}$=0.16 and $ν_{ca}$=0.11, respectively. However, the Cu-O distance in the $c$ direction exhibits a notable 0.9% increase at 1.1% $a$-axis compression. We further find strain-induced diffuse scattering which corresponds to a new type of two-dimensional charge correlation. Interestingly, this signal is insensitive to the onset of superconductivity and instead corresponds to a short-range, nearly commensurate modulation with a wave vector close to (0.5, 0, 0) and a correlation length of approximately four unit cells. It closely resembles the charge order theoretically predicted in the phase diagram of the spin-liquid model with resonating valence bonds on a square lattice. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_21343 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Strain-induced structural change and nearly-commensurate diffuse scattering in the model high-temperature superconductor HgBa$_2$CuO$_{4+δ}$ Ye, Mai Hong, Wenshan Lacmann, Tom Frachet, Mehdi Vinograd, Igor Garbarino, Gaston Souliou, Sofia-Michaela Merz, Michael Heid, Rolf Haghighirad, Amir-Abbas Li, Yuan Tacon, Matthieu Le Superconductivity We investigate the strain response of underdoped HgBa$_2$CuO$_{4+δ}$ (Hg1201), by synchrotron X-ray diffraction and corresponding simulations of thermal diffuse scattering. The compression in the crystallographic $a$ direction leads to relatively small expansion in the $b$ and $c$ directions, with Poisson ratios $ν_{ba}$=0.16 and $ν_{ca}$=0.11, respectively. However, the Cu-O distance in the $c$ direction exhibits a notable 0.9% increase at 1.1% $a$-axis compression. We further find strain-induced diffuse scattering which corresponds to a new type of two-dimensional charge correlation. Interestingly, this signal is insensitive to the onset of superconductivity and instead corresponds to a short-range, nearly commensurate modulation with a wave vector close to (0.5, 0, 0) and a correlation length of approximately four unit cells. It closely resembles the charge order theoretically predicted in the phase diagram of the spin-liquid model with resonating valence bonds on a square lattice. |
| title | Strain-induced structural change and nearly-commensurate diffuse scattering in the model high-temperature superconductor HgBa$_2$CuO$_{4+δ}$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2510.21343 |