| Autor: |
Jerzembeck, Fabian, Røising, Henrik S., Steppke, Alexander, Rosner, Helge, Sokolov, Dmitry A., Kikugawa, Naoki, Scaffidi, Thomas, Simon, Steven H., Mackenzie, Andrew P., Hicks, Clifford W. |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Nature Communication 13, 4596 (2022) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1038/s41467-022-32177-4 |
| Popis: |
Applying in-plane uniaxial pressure to strongly correlated low-dimensional systems has been shown to tune the electronic structure dramatically. For example, the unconventional superconductor Sr$_2$RuO$_4$ can be tuned through a single Van Hove singularity which results in a strong enhancement of both $T_\text{c}$ and $H_\text{c2}$. Out-of-plane ($c$ axis) uniaxial pressure is expected to tune the quasi-two-dimensional structure even more strongly, causing it to approach two Van Hove singularities simultaneously. Here we achieve a record value of $3.2$ GPa compression along the $c$ axis of Sr$_2$RuO$_4$. Although the rise in $H_\text{c2}$ shows that we are indeed approaching the van Hove points, $T_\text{c}$ is suppressed, a result that contradicts expectations based on simple two-dimensional models. As a first attempt to take the third dimension into account, we present three-dimensional calculations in the weak interaction limit, and discuss the extent to which they are consistent with observation. Our experimental results highlight the importance of out-of-plane effects in low-dimensional systems in general and provide new constraints on theories of the pairing interaction in Sr$_2$RuO$_4$. |
| Databáze: |
arXiv |
| Externí odkaz: |
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