Fate of the Hebel-Slichter peak in superconductors with strong antiferromagnetic fluctuations

Abstract

We show that magnetic fluctuations can destroy the Hebel-Slichter peak in conventional superconductors. The Hebel-Slichter peak has previously been expected to survive even in the presence of strong electronic interactions. However, we show that antiferromagnetic fluctuations suppress the peak at $\mathbf{q}=0$ in the imaginary part of the magnetic susceptibility, ${\chi }_{+-}^{\prime \prime }\left(\mathbf{q},\omega \right)$, which causes the Hebel-Slichter peak. This is of general interest as in many materials superconductivity is found near a magnetically ordered phase, and the absence of a Hebel-Slichter peak is taken as evidence of unconventional superconductivity in these systems. For example, no Hebel-Slichter peak is observed in the $\kappa$-(BEDT-TTF)${}_{2}X$ organic superconductors but heat capacity measurements have been taken to indicate $s$-wave superconductivity. If antiferromagnetic fluctuations destroy the putative Hebel-Slichter peak in organic superconductors then the peak should be restored by applying a pressure, which is known to suppress antiferromagnetic correlations in these materials.

References in corpus (45)

• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• High-temperature superconductivity in iron-based materials
• A Common Thread: the pairing interaction for the unconventional superconductors
• Magnetism, superconductivity, and pairing symmetry in Fe-based superconductors
• A minimal two-band model for the superconducting Fe-pnictides
• The Challenge of Unconventional Superconductivity
• Non-perturbative many-body approach to the Hubbard model and single-particle pseudogap
• Quantum frustration in organic Mott insulators: from spin liquids to unconventional superconductors
• Multiband magnetism and superconductivity in Fe-based compounds
• Pairing due to Spin Fluctuations in Layered Organic Superconductors
• Imaging Cooper Pairing of Heavy Fermions in CeCoIn5
• Nodal Structure of Unconventional Superconductors Probed by the Angle Resolved Thermal Transport Measurements
• Strong electronic correlations in superconducting organic charge transfer salts
• Space group symmetry, spin-orbit coupling and the low energy effective Hamiltonian for iron based superconductors
• kappa-(BEDT-TTF)_2Cu[N(CN)_2]Br: a Fully Gapped Strong-Coupling Superconductor
• Low Temperature Penetration depth of κ-(ET)_2Cu[N(CN)_2]Br and κ-(ET)_2Cu(NCS)_2
• Comparison of the phase diagram of the half-filled layered organic superconductors with the phase diagram of the RVB theory of the Hubbard-Heisenberg model
• Specific heat measurements of the gap structure of the organic superconductors kappa-(ET)_2Cu[N(CN)_2]Br and kappa-(ET)_2Cu(NCS)_2
• Feedback spin resonance in superconducting CeCu${}_2$Si${}_2$ and CeCoIn${}_5$
• d_{x^2-y^2}- vs. d_{xy}- like pairings in organic superconductors κ-(BEDT-TTF)_2 X
• Bandwidth-controlled Mott transition in kappa-(BEDT-TTF)2Cu[N(CN)2]Br{x}Cl{1-x}: Optical studies of correlated carriers
• High-resolution ac-calorimetry studies of the quasi-2D organic superconductor $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$
• The Dependence of the Superconducting Transition Temperature of Organic Molecular Crystals on Intrinsically Non-Magnetic Disorder: a Signature of either Unconventional Superconductivity or Novel Local Magnetic Moment Formation
• Hund interaction, spin-orbit coupling and the mechanism of superconductivity in strongly hole-doped iron pnictides
• Antiferromagnetic Spin Fluctuation above the Superconducting Dome and the Full-Gaps Superconducting State in LaFeAsO1-xFx Revealed by 75As-Nuclear Quadrupole Resonance
• Symmetry of the superconducting order parameter in frustrated systems determined by the spatial anisotropy of spin correlations
• Near-degeneracy of extended $s+d_{x^2-y^2}$ and $d_{xy}$ order parameters in quasi-two-dimensional organic superconductors
• Evidence for a cos(4φ) Modulation of the Superconducting Energy Gap of Optimally Doped FeTe_{0.6}Se_{0.4} Single Crystals Using Laser Angle-Resolved Photoemission Spectroscopy
• Evidence for eight node mixed-symmetry superconductivity in a correlated organic metal
• Superconducting gap with sign reversal between hole pockets in heavily hole-doped Ba1-xKxFe2As2
• Strong Coupling and Double Gap Density of States in Superconducting MgB2
• Evidence of d-wave Superconductivity in K_(1-x)Na_xFe_2As_2 (x = 0, 0.1) Single Crystals from Low-Temperature Specific Heat Measurements
• Entangled Orbital Triplet Pairs in Iron-Based Superconductors
• Location of gap nodes in the organic superconductors $\kappa$-(ET)${}_2$Cu(NCS)${}_2$ and $\kappa$-(ET)${}_2$Cu[N(CN)${}_2$]Br determined by magnetocalorimetry
• Superconductivity in correlated BEDT-TTF molecular conductors: critical temperatures and gap symmetries
• In-plane superfluid density and microwave conductivity of the organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br: evidence for d-wave pairing and resilient quasiparticles
• Impurity Effect on the In-plane Penetration Depth of the Organic Superconductors $\kappa$-(BEDT-TTF)${}_{2}X$ ($X$ = Cu(NCS)${}_2$ and Cu[N(CN)${}_2$]Br)
• Pseudogap Induced by Superconducting Fluctuation in the d-p Model
• Mixed order parameters, accidental nodes and broken time reversal symmetry in organic superconductors: a group theoretical analysis
• Antiferromagnetic Spin Fluctuations and the Pseudogap in the Paramagnetic Phases of Quasi-Two-Dimensional Organic Superconductors
• Spin Fluctuations and the Pseudogap in Organic Superconductors
• Antiferromagnetic Spin Fluctuations in the Metallic Phase of Quasi-Two-Dimensional Organic Superconductors
• Mixed pairing symmetry in κ-(BEDT-TTF)_2 X organic superconductors from ultrasonic velocity measurements
• Vertex Corrections and the Korringa Ratio in Strongly Correlated Electron Materials
• Nuclear Magnetic Resonance in Low-Symmetry Superconductors

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• Thermodynamics of an Exactly Solvable Model for Superconductivity in a Doped Mott Insulator
• Fully-gapped superconductivity with rotational symmetry breaking in pressurized kagome metal CsV${}_3$Sb${}_5$
• Spin relaxation, Josephson effect and Yu-Shiba-Rusinov states in superconducting bilayer graphene
• Transmission of radio-frequency waves and nuclear magnetic resonance in lanthanum superhydrides