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- Title
Evening out the spin and charge parity to increase Tc in Sr2RuO4.
- Authors
Acharya, Swagata; Pashov, Dimitar; Weber, Cédric; Park, Hyowon; Sponza, Lorenzo; Schilfgaarde, Mark Van
- 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 superconducting 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 co-operate 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. The mechanism behind unconventional superconductivity in Sr2RuO4 is still not fully understood and results from a complex interplay between spin, charge and orbital degrees of freedom. The authors develop a parameter-free theoretical approach and demonstrate that the superconductivity exhibits both singlet and triplet components the relative strength of which is dependent on the interplay between the spin and charge fluctuations and can be controlled by strain.
- Subjects
STRONTIUM compounds; SUPERCONDUCTIVITY; QUASIPARTICLES; MEAN field theory; EIGENVALUES
- Publication
Communications Physics, 2019, Vol 2, Issue 1, p1
- ISSN
2399-3650
- Publication type
Article
- DOI
10.1038/s42005-019-0254-1