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.

arXiv comment11 pages, 9 figures, including supplemental material

References in corpus (29)

• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
• The Order Parameter for the Superconducting Phases of UPt${}_3$
• Extreme magnetic field-boosted superconductivity
• Review of U-based Ferromagnetic Superconductors: Comparison between UGe2, URhGe, and UCoGe
• Anisotropy and Magnetism in the LSDA+U Method
• Hidden quasi one-dimensional superconductivity in Sr${}_2$RuO${}_4$
• Spin-triplet superconductivity due to antiferromagnetic spin-fluctuation in Sr_2RuO_4
• Insulator-metal transition and topological superconductivity in UTe2 from a first-principles calculation
• Evidence for a pressure-induced antiferromagnetic quantum critical point in intermediate valence UTe2
• Pairing symmetry and dominant band in Sr2RuO4
• Low energy band structure and symmetries of UTe2 from angle resolved photoemission spectroscopy
• Incommensurate Spin Fluctuations in the Spin-triplet Superconductor Candidate UTe${}_2$
• Spin-triplet `f-wave' pairing proposed for an organic superconductor (TMTSF)_2 PF_6
• Topological band and superconductivity in UTe${}_2$
• Mechanism of spin-triplet superconductivity in Sr2RuO4
• Emergent BCS regime of the two-dimensional fermionic Hubbard model: ground-state phase diagram
• Resonance from antiferromagnetic spin fluctuations for superconductivity in UTe${}_2$
• Pairing symmetry of the one-band Hubbard model in the paramagnetic weak-coupling limit: a numerical RPA study
• A crib-shaped triplet pairing gap function for an orthogonal pair of quasi-one dimensional Fermi surfaces in Sr${}_2$RuO${}_4$
• d- and p-wave superconductivity mediated by spin fluctuations in two- and three-dimensional single-band repulsive Hubbard model
• Exotic multi-gap structure in UPt${}_3$ unveiled by the first-priniciples analysis
• Spin excitations in a model of FeSe with orbital ordering
• Spin-Orbit Coupling Induced Degeneracy in the Anisotropic Unconventional Superconductor UTe${}_2$
• UTe${}_2$: a nearly insulating half-filled $j=\frac{5}{2}$ $5f^3$ heavy fermion metal
• Electronic theory for superconductivity in Sr${}_2$RuO${}_4$: triplet pairing due to spin-fluctuation exchange
• Feedback of superconductivity on the magnetic excitation spectrum of UTe${}_2$
• Spin-Triplet Superconductivity in UTe2 and Ferromagnetic Superconductors
• Superconducting phase diagram of the paramagnetic one-band Hubbard model

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• 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