Manipulating superconductivity in ruthenates through Fermi surface engineering

Abstract

The key challenge in superconductivity research is to go beyond the historical mode of discovery-driven research. We put forth a new strategy, which is to combine theoretical developments in the weak-coupling renormalization group approach with the experimental developments in lattice strain driven Fermi surface-engineering. For concreteness we theoretically investigate how superconducting tendencies will be affected by strain engineering of ruthenates' Fermi surface. We first demonstrate that our approach qualitatively reproduces recent experiments under uniaxial strain. We then note that order few $\%$ strain readily accessible to epitaxial thin films, can bring the Fermi surface close to van Hove singularity. Using the experimental observation of the change in the Fermi surface under biaxial epitaxial strain and ab-initio calculations, we predict ${\mathrm{T}}_{\mathrm{c}}$ for triplet pairing to be maximized by getting close to the van Hove singularities without tuning on to the singularity.

arXiv comment5 + 2 pages, 4 + 5 figures

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• High sensitivity heat capacity measurements on Sr2RuO4 under uniaxial pressure
• The Superconductivity of Sr${}_2$RuO${}_4$ Under $c$-Axis Uniaxial Stress
• Ab initio study of magnetocrystalline anisotropy, magnetostriction, and Fermi surface of L10 FeNi (tetrataenite)
• Theory of Strain-Induced Magnetic Order and Splitting of $T_c$ and $T_{\mathrm{TRSB}}$ in Sr${}_2$RuO${}_4$
• Possible three-dimensional nematic odd-parity superconductivity in Sr${}_2$RuO${}_4$
• Atomically precise lateral modulation of a two-dimensional electron liquid in anatase TiO2 thin films
• Superconducting pairing in Sr${}_2$RuO${}_4$ from weak to intermediate coupling
• Theory of the Evolution of Superconductivity in Sr${}_2$RuO${}_4$ under Anisotropic Strain
• Deviation from the Fermi-Liquid Transport Behavior in the Vicinity of a Van Hove Singularity
• Superconductivity in Sr${}_2$RuO${}_4$ thin film under biaxial strain
• Electron nematic fluid in a strained Sr3Ru2O7 film
• Spin-orbit and anisotropic strain effects on the electronic correlations of Sr${}_2$RuO${}_4$
• Electronic and vibrational signatures of ruthenium vacancies in Sr${}_2$RuO${}_4$ thin films
• Multiband mean-field theory of the $d+ig$ superconductivity scenario in Sr${}_2$RuO${}_4$
• SrRuO${}_3$-SrTiO${}_3$ heterostructure as a possible platform for studying unconventional superconductivity in Sr${}_2$RuO${}_4$
• Tunable electronic and magnetic phases in layered ruthenates: SrRuO3-SrTiO3 heterostructure upon strain
• Superconducting gap anisotropy and topological singularities due to lattice translational symmetry and their thermodynamic signatures
• Robust semi-Dirac points and unconventional topological phase transitions in doped superconducting Sr2IrO4 tunnel coupled to t2g electron systems
• Even odder after twenty-three years: the superconducting order parameter puzzle of Sr2RuO4
• Competing spin-fluctuations in Sr${}_2$RuO${}_4$ and their tuning through epitaxial strain