Spin triplet superconductivity driven by finite momentum spin fluctuations

Abstract

A small number of superconductors are believed to exhibit intrinsic spin triplet pairing, and they are often discussed in terms of a simple, ${}^3$He-like picture where ferromagnetic spin fluctuations provide the "glue". However, in some cases in which reliable inelastic neutron scattering measurements are available, spin excitations are found to be peaked at finite momentum $\mathbf{q}$ rather than $\mathbf{q}=0$. Here we investigate some simple models that exhibit triplet pairing arising from antiferromagnetic spin fluctuations. We show that a strong peak at larger $\mathbf{q}$ in the magnetic susceptibility can drive such states and can give rise to pairing states with nodes in the $k_z$ plane even in the presence of a pure 2D Fermi surface. In these situations, dominant pair scattering processes occur between Fermi surface segments with like signs of the superconducting order parameter, yet they are consistent with an overall odd parity state. We examine the applicability of these scenarios to putative triplet superconductors UTe${}_2$ by calculations based on three dimensional Fermi surfaces.

11 pages, 9 figures, including supplemental material

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Cited by in corpus (15)

• Field-induced tuning of the pairing state in a superconductor
• Superconductivity from repulsive interactions on the kagome lattice
• A review of UTe${}_2$ at high magnetic fields
• Symmetry of magnetic correlations in spin-triplet superconductor UTe2
• Ubiquitous Spin Freezing in the Superconducting State of UTe2
• Revisiting superconductivity in the extended one-band Hubbard model: pairing via spin and charge fluctuations
• Multiple superconducting phases in heavy-fermion metals
• Thermodynamic transitions and topology of spin-triplet superconductivity: Application to UTe${}_2$
• Incommensurate antiferromagnetism in UTe2 under pressure
• Microscopic origin of ultranodal superconducting states in spin-1/2 systems
• ${\mu }^{+}$ Knight Shift in UTe${}_2$: Evidence for Relocalization in a Kondo Lattice
• Rashba spin-orbit coupling in infinite-layer nickelate films on SrTiO3(001) and KTaO3(001)
• Two-dimensional flat band on the (011) surface of UTe${}_2$: Implication for STM measurements with a superconducting tip
• Metamagnetism in the high-pressure tetragonal phase of UTe${}_2$
• Magnetic fluctuations and anisotropy in UTe2: a multi-orbital study based on GGA+U and RPA