Theory for superconductivity in alkali chromium arsenides A2Cr3As3 (A=K,Rb,Cs)

Abstract

We propose an extended Hubbard model with three molecular orbitals on a hexagonal lattice with $D_{3h}$ symmetry to study recently discovered superconductivity in A${}_2$Cr${}_3$As${}_3$ (A=K,Rb,Cs). Effective pairing interactions from paramagnon fluctuations are derived within the random phase approximation, and are found to be most attractive in spin triplet channels. At small Hubbard $U$ and moderate Hund's coupling, the pairing arises from 3-dimensional (3D) $\gamma$ band and has a spatial symmetry $f_{y(3x^2-y^2)}$, which gives line nodes in the gap function. At large $U$, a fully gapped $p$-wave state, $p_z\hat{z}$ dominates at the quasi-1D $\alpha$-band.

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• Superconductivity in the vicinity of antiferromagnetic order in CrAs
• Superconductivity in quasi-one-dimensional K${}_2$Cr${}_3$As${}_3$ with significant electron correlations
• Spin-triplet p-wave pairing in a 3-orbital model for iron pnictide superconductors
• Unconventional superconductivity in quasi-one-dimensional Rb${}_2$Cr${}_3$As${}_3$
• Superconductivity in quasi-one-dimensional Cs2Cr3As3 with large interchain distance
• NMR Investigation of the Quasi One-dimensional Superconductor K${}_2$Cr${}_3$As${}_3$
• Electronic structure of quasi-one-dimensional superconductor K${}_2$Cr${}_3$As${}_3$ from first-principles calculations
• Anisotropic $H_{c2}$, thermodynamic and transport measurements, and pressure dependence of $T_c$ in K${}_2$Cr${}_3$As${}_3$ single crystals
• Magnetism in Quasi-One-Dimensional A${}_2$Cr${}_3$As${}_3$ (A=K,Rb) superconductors

Cited by in corpus (28)

• Spin-Triplet Superconductivity in K2Cr3As3
• Spin-triplet $f$-wave pairing in twisted bilayer graphene near 1/4 filling
• Tuning the distance to a possible ferromagnetic quantum critical point in A2Cr3As3
• Superconductivity at 10.4 K in a novel quasi-one-dimensional ternary molybdenum pnictide K2Mo3As3
• Superconductivity at 7.3 K in the 133-type Cr-based RbCr3As3 single crystals
• Nodal superconducting gap structure in the quasi-one-dimensional Cs${}_2$Cr${}_3$As${}_3$ investigated using $\mu$SR measurements
• A brief review on muSR studies of unconventional Fe and Cr-based superconductors
• Coexistence of nontrivial topological properties and strong ferromagnetic fluctuations in $A_2$Cr${}_3$As${}_3$ ($A$=Na, K, Rb and Cs)
• A minimal tight-binding model for the quasi-one-dimensional superconductor K2Cr3As3
• Frustrated structural instability in superconducting quasi-one-dimensional K${}_2$Cr${}_3$As${}_3$
• Lifshitz Transition and Nontrivial H-Doping Effect in Cr-based Superconductor KCr${}_3$As${}_3$H${}_x$
• Evidence for triplet superconductivity near an antiferromagnetic instability in CrAs
• Topological superconductor in quasi-one-dimensional Tl2-xMo6Se6
• Structural Instability and Magnetism of Superconducting KCr${}_3$As${}_3$
• Singlet $s^{\pm }$-wave pairing in quasi-one-dimensional ACr${}_3$As${}_3$ (A=K, Rb, Cs) superconductors
• Spin and charge density waves in the quasi-one-dimensional KMn6Bi5
• K2Mo3As3 is a Multi-Gap Electron-Phonon Superconductor
• Optimizing the tight-binding parametrization of the quasi-one-dimensional superconductor K2Cr3As3
• Multiband superconductivity and possible nodal gap in RbCr${}_3$As${}_3$ revealed by Andreev reflection and single-particle tunneling measurements
• Intrinsic topological superconductivity with exactly flat surface bands in the quasi-one-dimensional A${}_2$Cr${}_3$As${}_3$ (A=Na, K, Rb, Cs) superconductors
• Reemergence of superconductivity in pressurized quasi-one-dimensional superconductor K2Mo3As3
• Lifshitz transition enhanced triplet $p_z$-wave superconductivity in hydrogen doped KCr${}_3$As${}_3$
• Interplay of Zeeman field, Rashba spin-orbit interaction, and superconductivity: Transition temperature and quasiparticle excitation
• The upper critical field and its anisotropy in RbCr${}_3$As${}_3$
• Interplay of Zeeman field, Rashba spin-orbit interaction, and superconductivity: spin susceptibility
• Multiple phases in K2Cr3As3: a playground for manipulating topological superconductivity
• Topological $p_z$-wave nodal-line superconductivity with flat surface bands in the AH${}_x$Cr${}_3$As${}_3$ (A=Na, K, Rb, Cs) superconductors
• Hydrogen Doping Induced $p_x\pm i{p}_y$ Triplet Superconductivity in Quasi-One-Dimensional K${}_2$Cr${}_3$As${}_3$