Test for Pairing Symmetry Based on Spin Fluctuations in Organic Superconductors $\kappa$-(BEDT-TTF)${}_2$X

Abstract

We propose that the superconducting pairing symmetry of organic superconductors $\kappa$-(BEDT-TTF)${}_2$X can be determined by measuring the position in momentum space of the incommensurate peaks of the spin susceptibility. We show that the positions of these peaks are uniquely determined by the symmetry of the superconducting state and the geometry of Fermi surface. Based on the effective Hubbard model on an anisotropic triangular lattice, we demonstrate the different incommensurate patters of spin responses for $d_{x^2-y^2}$- and $d_{xy}$-like pairing states. In addition, we predict the nonexistence of the spin resonance mode in this compound, which is an important feature in high-$T_c$ superconductors.

arXiv comment4 pages, 5 figures

References in corpus (13)

• Mott transition, antiferromagnetism, and unconventional superconductivity in layered organic superconductors
• Non-perturbative many-body approach to the Hubbard model and single-particle pseudogap
• Pairing due to Spin Fluctuations in Layered Organic Superconductors
• Magnetic Resonant Mode in the Single-Layer High Temperature Superconductor Tl${}_2$Ba${}_2$Cu${}_{6+\delta }$
• Superconducting Gap Structure of kappa-(BEDT-TTF)2Cu(NCS)2 Probed by Thermal Conductivity Tensor
• Spin Fluctuation-Induced Superconductivity in Organic Compounds
• kappa-(BEDT-TTF)_2Cu[N(CN)_2]Br: a Fully Gapped Strong-Coupling Superconductor
• The resonance peak in cuprate superconductors
• d_{x^2-y^2}- vs. d_{xy}- like pairings in organic superconductors κ-(BEDT-TTF)_2 X
• Theory of spin and charge fluctuations in the Hubbard model
• High-resolution ac-calorimetry studies of the quasi-2D organic superconductor $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$
• Small-q phonon-mediated superconductivity in organic κ-BEDT-TTF compounds
• Impurity effects on the spin excitation spectra in a d-wave superconductor

Cited by in corpus (4)

• Absence of superconductivity in the half-filled band Hubbard model on the anisotropic triangular lattice
• Pairing Symmetry Competition in Organic Superconductors
• Mixed pairing symmetry in κ-(BEDT-TTF)_2 X organic superconductors from ultrasonic velocity measurements
• Spin excitations in bilayer La${}_3$Ni${}_2$O${}_7$ superconductors with the interlayer pairing