Enhancement of Superfluid Stiffness, Suppression of Superconducting T_c and Field-induced Magnetism in the Pnictide Superconductor LiFeAs

Abstract

Transverse-field muon-spin rotation measurements performed on two samples of LiFeAs demonstrate that the superfluid stiffness of the superconducting condensate in relation to its superconducting transition temperature is enhanced compared to other pnictide superconductors. Evidence is seen for a field-induced magnetic state in a sample with a significantly suppressed superconducting transition temperature. The results in this system highlight the role of direct Fe-Fe interactions in frustrating pairing mediated by antiferromagnetic fluctuations and suggest that, in common with other pnictide superconductors, the system is close to a magnetic instability.

arXiv comment4 pages, 5 figures

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• Determination of the Upper Critical Field of a Single Crystal LiFeAs: The Magnetic Torque Study up to 35 Tesla
• NMR evidence of strong-correlated superconductivity in LiFeAs: tuning toward an SDW ordering
• Superconductivity and Field-Induced Magnetism in SrFe_1.75Co_0.25As_2
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• Microwave Surface Impedance Measurements of LiFeAs Single Crystals
• Small anisotropy of the lower critical field and $s_{\pm }$-wave two-gap feature in single crystal LiFeAs
• Lower Critical Field, Anisotropy, and Two-Gap Features of LiFeAs
• Effect of Li-deficiency impurities on the electron-overdoped LiFeAs superconductor
• 75As NMR-NQR study in superconducting LiFeAs
• Antiferromagnetic spin excitations in single crystals of nonsuperconducting Li1-xFeAs
• Muon-spin rotation measurements of the magnetic penetration depth in the Fe-based superconductor Ba_(1-x)Rb_(x)Fe2As2
• A view from inside iron-based superconductors
• Superfluid density and superconducting gaps of RbFe_{2}As_{2} as a function of hydrostatic pressure
• Probing the Ground State Properties of Iron-based Superconducting Pnictides and Related Systems by Muon-Spin Spectroscopy
• Magnetic fluctuations and spin freezing in nonsuperconducting LiFeAs derivatives
• Rutgers relation for the analysis of superfluid density in superconductors
• Optical properties of iron-based superconductor LiFeAs single crystal
• Structural phases of elemental Gallium: universal relations in type-I superconductors
• Coexistence of Clean- and Dirty-limit Superconductivity in LiFeAs
• New insight into the physics of iron pnictides from optical and penetration depth data
• Optical Conductivity Evidence of Clean-Limit Superconductivity in LiFeAs
• Robustness of superconductivity to structural disorder in Sr${}_{0.3}$(NH${}_2$)${}_y$(NH${}_3$)${}_{1-y}$Fe${}_2$Se${}_2$
• Penetration depth and gap structure in the antiperovskite oxide superconductor Sr${}_{3-x}$SnO revealed by $\mu$SR
• Absence of nematic instability in LiFeAs