Electronic theory for superconductivity in Sr2RuO4: Triplet pairing due to spin-fluctuation exchange

I. Eremin; D. Manske; C. Joas; K. H. Bennemann

doi:10.1209/epl/i2002-00455-9

Electronic theory for superconductivity in Sr₂RuO₄: Triplet pairing due to spin-fluctuation exchange

I. Eremin^*, D. Manske, C. Joas, K. H. Bennemann

^*Corresponding author for this work

29 Citations (Scopus)

Abstract

Using a Hubbard Hamiltonian for the three electronic bands crossing the Fermi level in Sr₂RuO₄, we calculate the band structure and spin susceptibility χ(q, w) in quantitative agreement with nuclear magnetic resonance (NMR) and inelastic neutron scattering (INS) experiments. The susceptibility has two peaks at Qi = (2π/3a, 2π/3a, 0) due to the nesting Fermi surface properties and at qi = (0.2π/a, 0, 0) due to the tendency towards ferromagnetism. Applying spin-fluctuation exchange theory as in layered cuprates we determine from χ(q,w), electronic dispersions, and Fermi surface topology that superconductivity in Sr₂RuO₄ consists of triplet pairing. Using X(q, w) we can exclude s- and d-wave symmetry for the superconducting order parameter. Furthermore, within our analysis and approximations we find that the order parameter will have a node between neighboring RuO₂-planes and that in the RuO₂-plane f_x²-y²-wave and p-wave symmetry are close in energy.

Original language	English
Journal	Europhysics Letters
Volume	58
Issue number	6
Pages (from-to)	871-877
Number of pages	7
ISSN	0295-5075
DOIs	https://doi.org/10.1209/epl/i2002-00455-9
Publication status	Published - 19 Aug 2002

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title = "Electronic theory for superconductivity in Sr2RuO4: Triplet pairing due to spin-fluctuation exchange",

abstract = "Using a Hubbard Hamiltonian for the three electronic bands crossing the Fermi level in Sr2RuO4, we calculate the band structure and spin susceptibility χ(q, w) in quantitative agreement with nuclear magnetic resonance (NMR) and inelastic neutron scattering (INS) experiments. The susceptibility has two peaks at Qi = (2π/3a, 2π/3a, 0) due to the nesting Fermi surface properties and at qi = (0.2π/a, 0, 0) due to the tendency towards ferromagnetism. Applying spin-fluctuation exchange theory as in layered cuprates we determine from χ(q,w), electronic dispersions, and Fermi surface topology that superconductivity in Sr2RuO4 consists of triplet pairing. Using X(q, w) we can exclude s- and d-wave symmetry for the superconducting order parameter. Furthermore, within our analysis and approximations we find that the order parameter will have a node between neighboring RuO2-planes and that in the RuO2-plane fx2-y2-wave and p-wave symmetry are close in energy.",

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T1 - Electronic theory for superconductivity in Sr2RuO4

T2 - Triplet pairing due to spin-fluctuation exchange

AU - Eremin, I.

AU - Manske, D.

AU - Joas, C.

AU - Bennemann, K. H.

PY - 2002/8/19

Y1 - 2002/8/19

N2 - Using a Hubbard Hamiltonian for the three electronic bands crossing the Fermi level in Sr2RuO4, we calculate the band structure and spin susceptibility χ(q, w) in quantitative agreement with nuclear magnetic resonance (NMR) and inelastic neutron scattering (INS) experiments. The susceptibility has two peaks at Qi = (2π/3a, 2π/3a, 0) due to the nesting Fermi surface properties and at qi = (0.2π/a, 0, 0) due to the tendency towards ferromagnetism. Applying spin-fluctuation exchange theory as in layered cuprates we determine from χ(q,w), electronic dispersions, and Fermi surface topology that superconductivity in Sr2RuO4 consists of triplet pairing. Using X(q, w) we can exclude s- and d-wave symmetry for the superconducting order parameter. Furthermore, within our analysis and approximations we find that the order parameter will have a node between neighboring RuO2-planes and that in the RuO2-plane fx2-y2-wave and p-wave symmetry are close in energy.

AB - Using a Hubbard Hamiltonian for the three electronic bands crossing the Fermi level in Sr2RuO4, we calculate the band structure and spin susceptibility χ(q, w) in quantitative agreement with nuclear magnetic resonance (NMR) and inelastic neutron scattering (INS) experiments. The susceptibility has two peaks at Qi = (2π/3a, 2π/3a, 0) due to the nesting Fermi surface properties and at qi = (0.2π/a, 0, 0) due to the tendency towards ferromagnetism. Applying spin-fluctuation exchange theory as in layered cuprates we determine from χ(q,w), electronic dispersions, and Fermi surface topology that superconductivity in Sr2RuO4 consists of triplet pairing. Using X(q, w) we can exclude s- and d-wave symmetry for the superconducting order parameter. Furthermore, within our analysis and approximations we find that the order parameter will have a node between neighboring RuO2-planes and that in the RuO2-plane fx2-y2-wave and p-wave symmetry are close in energy.

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Electronic theory for superconductivity in Sr₂RuO₄: Triplet pairing due to spin-fluctuation exchange

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