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The superconductivity of Sr2RuO4 under c-axis uniaxial stress
Max Planck Inst Chem Phys Solids, Nothnitzer Str 40, D-01187 Dresden, Germany..
NORDITA SU.
Max Planck Inst Chem Phys Solids, Nothnitzer Str 40, D-01187 Dresden, Germany..
Max Planck Inst Chem Phys Solids, Nothnitzer Str 40, D-01187 Dresden, Germany..
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2022 (English)In: Nature Communications, E-ISSN 2041-1723, Vol. 13, no 1, article id 4596Article in journal (Refereed) Published
Abstract [en]

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 Sr2RuO4 can be tuned through a single Van Hove point, resulting in strong enhancement of both T-c and H-c2. Out-of-plane (c axis) uniaxial pressure is expected to tune the quasi-two-dimensional structure even more strongly, by pushing it towards two Van Hove points simultaneously. Here, we achieve a record uniaxial stress of 3.2 GPa along the c axis of Sr2RuO4. H-c2 increases, as expected for increasing density of states, but unexpectedly T-c falls. As a first attempt to explain this result, we present three-dimensional calculations in the weak interaction limit. We find that within the weak-coupling framework there is no single order parameter that can account for the contrasting effects of in-plane versus c-axis uniaxial stress, which makes this new result a strong constraint on theories of the superconductivity of Sr2RuO4. In the superconductor Sr2RuO4, in-plane strain is known to enhance both the superconducting transition temperature Tc and upper critical field Hc2, but the effect of out-of-plane strain has not been studied. Here, the authors find that Hc2 is enhanced under out-of-plane strain, but Tc unexpectedly decreases.

Place, publisher, year, edition, pages
Springer Nature , 2022. Vol. 13, no 1, article id 4596
National Category
Fusion, Plasma and Space Physics Nano Technology
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URN: urn:nbn:se:kth:diva-316796DOI: 10.1038/s41467-022-32177-4ISI: 000836839500019PubMedID: 35933412Scopus ID: 2-s2.0-85135493095OAI: oai:DiVA.org:kth-316796DiVA, id: diva2:1691327
Note

QC 20220830

Available from: 2022-08-30 Created: 2022-08-30 Last updated: 2023-09-25Bibliographically approved

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