Exploring multichannel superconductivity in ThFeAsN

Abstract

We investigate theoretically the superconducting state of the undoped Fe-based superconductor ThFeAsN. Using input from $abinitio$ calculations, we solve the Fermi-surface based, multichannel Eliashberg equations for Cooper-pair formation mediated by spin and charge fluctuations, and by the electron-phonon interaction (EPI). Our results reveal that spin fluctuations alone, when coupling only hole-like with electron-like energy bands, can account for a critical temperature $T_c$ up to $\sim 7.5\mathrm{K}$ with an $s_{\pm }$-wave superconducting gap symmetry, which is a comparatively low $T_c$ with respect to the experimental value $T_c^{\exp }=30\mathrm{K}$. Other combinations of interaction kernels (spin, charge, electron-phonon) lead to a suppression of $T_c$ due to phase frustration of the superconducting gap. We qualitatively argue that the missing ingredient to explain the gap magnitude and $T_c$ in this material is the first-order correction to the EPI vertex. In the noninteracting state this correction adopts a form supporting the $s_{\pm }$ gap symmetry, in contrast to EPI within Migdal's approximation, i.e., EPI without vertex correction, and therefore it enhances tendencies arising from spin fluctuations.

References in corpus (44)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Advanced capabilities for materials modelling with Quantum ESPRESSO
• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• Superconductivity in Iron Compounds
• High-temperature superconductivity in iron-based materials
• LaFeAsO${}_{1-x}$F${}_x$: A low carrier density superconductor near itinerant magnetism
• Superconductivity at 36 K in beta-Fe1.01Se with the compression of the interlayer separation under pressure
• Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
• LiFeAs: An Intrinsic FeAs-based Superconductor with Tc = 18K
• Magnetism, superconductivity, and pairing symmetry in Fe-based superconductors
• Pnictogen height as a possible switch between high-T_c nodeless and low-T_c nodal pairings in the iron based superconductors
• Fermi surface nesting induced strong pairing in iron-based superconductors
• Electronic structure of the iron-based superconductor LaOFeP
• Iron based high transition temperature superconductors
• Fermi surface of superconducting LaFePO determined by quantum oscillations
• Strong-coupling theory of superconductivity in a degenerate Hubbard model
• Using Gap Symmetry and Structure to Reveal the Pairing Mechanism in Fe-based Superconductors
• Eliashberg Theory: a short review
• Sensitivity of the superconducting state and magnetic susceptibility to key aspects of electronic structure in ferropnictides
• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Electronic Structure of Fe-Based Superconductors
• Pairing symmetry in a two-orbital Hubbard model on a square lattice
• A New ZrCuSiAs-Type Superconductor: ThFeAsN
• Spin Fluctuation Induced Superconductivity Controlled by Orbital Fluctuation
• Full-bandwidth Eliashberg theory of superconductivity beyond Migdal's approximation
• Advanced first-principles theory of superconductivity including both lattice vibrations and spin fluctuations: The case of FeB${}_4$
• Multigap superconductivity in ThAsFeN investigated using muSR measurements
• High-$T_{\mathrm{c}}$ superconductivity in undoped ThFeAsN
• Eliashberg theory for spin-fluctuations mediated superconductivity -- Application to bulk and monolayer FeSe
• Accurate bare susceptibilities from full-potential $\text{ab initio}$ calculations
• ThFeAsN in Relation to Other Iron-Based Superconductors
• Self-consistent temperature dependence of quasiparticle bands in monolayer FeSe on SrTiO${}_3$
• Electronic structure of iron-based superconductors: from pnictides to chalcogenides and other similar systems
• Increased Performance of Matsubara space calculations: A case study within Eliashberg theory
• Multichannel superconductivity of monolayer FeSe on SrTiO${}_3$: Interplay of spin fluctuations and electron-phonon interaction
• Neutron powder diffraction study on the iron-based nitride superconductor ThFeAsN
• Pressure induced Lifshitz transition in ThFeAsN
• Peculiar Phase Diagram with Isolated Superconducting Regions in ThFeAsN${}_{1-x}$O${}_x$
• Electronic structure, lattice dynamics and magnetism of new ThXAsN (X=Fe,Co,Ni) superconductors: A First Principles Study
• Antiadiabatic Phonons and Superconductivity in Eliashberg-McMillan Theory
• Suppression of superconductivity by spin fluctuations in iron-based superconductors
• Pressure effects on the electronic properties of the undoped superconductor ThFeAsN
• Neutron powder diffraction study on the non-superconducting phases of ThFeAsN${}_{1-x}$O${}_x$ ($x=0.15,0.6$) iron pnictide

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