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Evening out the spin and charge parity to increase Tc in Sr 2RuO 4

Abstract : Unconventional superconductivity in Sr 2 RuO 4 has been intensively studied for decades. However, the nature of pairing continues to be widely debated. Here we develop a detailed ab initio theory, coupling quasiparticle self-consistent GW approximation with dynamical mean field theory (DMFT), including both local and non-local correlations to address the subtle interplay among spin, charge and orbital degrees of freedom. We report that the super-conducting instability has multiple triplet and singlet components. In the unstrained case the triplet eigenvalues are larger than the singlets. Under uniaxial strain, the triplet eigenvalues drop and the singlet components increase. This is concomitant with our observation of spin and charge fluctuations shifting closer to wave-vectors favoring singlet pairing. We identify a complex mechanism where charge fluctuations and spin fluctuations cooperate in the even-parity channel under strain leading to increment in critical temperature (Tc), thus proposing a novel mechanism for pushing the frontier of critical temperature (Tc) in unconventional 'triplet' superconductors.
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Submitted on : Wednesday, May 27, 2020 - 11:46:10 AM
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Swagata Acharya, Dimitar Pashov, Cedric Weber, Hyowon Park, Lorenzo Sponza, et al.. Evening out the spin and charge parity to increase Tc in Sr 2RuO 4. Communications Physics, Nature Research, 2019, 2 (1), ⟨10.1038/s42005-019-0254-1⟩. ⟨hal-02632903⟩



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