NMR evidence of strong-correlated superconductivity in LiFeAs: tuning toward an SDW ordering

Abstract

In this letter, we reported the results of NMR study on LiFeAs single crystals. We find a strong evidence of the low temperature spin fluctuations; by changing sample preparation conditions, the system can be tuned toward an spin-density-wave (SDW) quantum-critical point. The detection of an interstitial Li(2) ion, possibly locating in the tetrahedral hole, suggests that the off-stoichiometry and/or lattice defect can probably account for the absence of the SDW ordering in LiFeAs. These facts show that LiFeAs is a strongly correlated system and the superconductivity is likely originated from the SDW fluctuations.

5 pages, s figures

References in corpus (22)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Superconductivity at 43 K in Samarium-arsenide Oxides $SmFeAs{O}_{1-x}{F}_x$
• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• Superconductivity at 41 K and its competition with spin-density-wave instability in layered CeO${}_{1-x}$F${}_x$FeAs
• Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
• The superconductivity at 18 K in LiFeAs system
• LiFeAs: An Intrinsic FeAs-based Superconductor with Tc = 18K
• Competing Orders and Spin-Density-Wave Instability in La(O${}_{1-x}$F${}_x$)FeAs
• Funtional Renormalization Group Study of the Pairing Symmetry and Pairing Mechanism of the FeAs Based High Temperature Superconductors
• Electronic Structure and Doping in BaFe${}_2$As${}_2$ and LiFeAs: Density Functional Calculations
• Coexistence of the spin-density-wave and superconductivity in the (Ba,K)Fe2As2
• Multiband magnetism and superconductivity in Fe-based compounds
• Structure and superconductivity of LiFeAs
• Commensurate Itinerant Antiferromagnetism in BaFe2As2: 75As-NMR Studies on a Self-Flux Grown Single Crystal
• Spin susceptibility, phase diagram, and quantum criticality in the electron-doped high Tc Superconductor Ba[Fe(1-x)Co(x)]2As2
• Spin Fluctuations, Interband Coupling, and Unconventional Pairing in Iron-based Superconductors
• Strong-coupling Spin-singlet Superconductivity with Multiple Full Gaps in Hole-doped Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ Probed by Fe-NMR
• Weak superconducting pairing and a single isotropic energy gap in stoichiometric LiFeAs
• ${}^{75}$As NQR and NMR studies of superconductivity and electron correlations in iron arsenide Li${}_x$FeAs
• Electronic Structure of New LiFeAs High-Tc Superconductor
• Stripe antiferromagnetic correlations in LaFeAsO1-xFx probed by 75As NMR
• Enhancement of Superfluid Stiffness, Suppression of Superconducting T_c and Field-induced Magnetism in the Pnictide Superconductor LiFeAs

Cited by in corpus (21)

• Superconductivity in Iron Compounds
• Unconventional Anisotropic s-Wave Superconducting Gaps of LiFeAs Iron-Pnictide Superconductor
• Spin fluctuations in LiFeAs observed by neutron scattering
• Nodeless vs nodal order parameters in LiFeAs and LiFeP superconductors
• Observation of strong electron pairing on bands without Fermi surfaces in LiFe1-xCoxAs
• 77Se NMR study of pairing symmetry and spin dynamics in KyFe2-xSe2
• Time of life as it is in LiFeAs
• Sign inversion in the superconducting order parameter of LiFeAs inferred from Bogoliubov quasiparticle interference
• Contrasts in electron correlations and inelastic scattering between LiFeAs and LiFeP revealed by charge transport
• 75As NMR-NQR study in superconducting LiFeAs
• Electronic structure of BaNi${}_2$As${}_2$
• Electronic structure of Ni-doped EuRbFe${}_4$As${}_4$: Unique crystal field splitting and multiband RKKY interactions
• Superconductivity and normal state properties of single-crystalline Tl0.47Rb0.34Fe1.63Se2 as seen via 77Se and 87Rb NMR
• Longitudinal magnetoresistance in Co-doped BaFe2As2 and LiFeAs single crystals: Interplay between spin fluctuations and charge transport in iron-pnictides
• Enhanced anisotropic spin fluctuations below tetragonal-to-orthorhombic transition in LaFeAs(O_{1-x}F_x) probed by ^{75}As and ^{139}La NMR
• Review of nuclear magnetic resonance studies on iron-based superconductors
• Probing the Order Parameter of Superconducting LiFeAs using Pb/LiFeAs and Au/LiFeAs Point-Contact Spectroscopy
• Optical Conductivity Evidence of Clean-Limit Superconductivity in LiFeAs
• 31P NMR Investigation of the Superconductor LiFeP (Tc = 5 K)
• Anisotropy of the superconducting fluctuations in multiband superconductors: the case of LiFeAs
• Nodal superconducting gap in LiFeP revealed by NMR: contrast with LiFeAs