Single crystal growth and superconducting properties of LiFeAs

Abstract

We report the successful growth of high quality single crystals of LiFeAs with lateral sizes up to 5 x 5 mm2 by the Sn-flux method. Electrical resistivity studies reveal that the superconducting onset temperature is 18.2 K with a transition width less than 1.1 K and the ratio of room temperature to residual resistivity is about 24. Bulk superconductivity is supported by perfect shielding in the magnetic susceptibility and a clear jump in the specific heat Cp, resulting in deltaCp/T ~ 20.0 mJ/mol*K2. Upper critical field slopes of dHc2c/dT ~ -1.39 and dHc2ab/dT ~ -2.99 T/K near Tc predict zero temperature upper critical fields of Hc2c(0) ~ 17.2 and Hc2ab(0) ~ 36.9 T and coherence lengths of Xi_ab = 4.4 and Xi_c = 2.0 nm in a single band model. This result points to a modest superconducting anisotropy about 2.3 in LiFeAs.

18 pages, 4 figures

References in corpus (19)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• The superconductivity at 18 K in LiFeAs system
• LiFeAs: An Intrinsic FeAs-based Superconductor with Tc = 18K
• Nearly Isotropic superconductivity in (Ba,K)Fe2As2
• Anisotropic thermodynamic and transport properties of single crystalline (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$ (x = 0 and 0.45)
• Coexistence of the spin-density-wave and superconductivity in the (Ba,K)Fe2As2
• Upper critical fields and thermally-activated transport of Nd(O_0.7F_0.3)FeAs single crystal
• Structure and superconductivity of LiFeAs
• Structure, antiferromagnetism and superconductivity of the layered iron arsenide NaFeAs
• Upper critical field, anisotropy, and superconducting properties of Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ single crystals
• Evidence for dominant Pauli paramagnetic effect in the upper critical fields of a FeTe0.6Se0.4 superconductor
• Psuedo-isotropic upper critical field in cobalt-doped SrFe2As2 epitaxial films
• Resistivity and upper critical field in KFe${}_2$As${}_2$ single crystals
• Weak superconducting pairing and a single isotropic energy gap in stoichiometric LiFeAs
• Synthesis, anisotropy, and superconducting properties of LiFeAs single crystal
• Caloric Determination of the Upper Critical Fields and Anisotropy of NdFeAsO1-xFx Single Crystals
• Evidence for multiple gaps in specific heat of LiFeAs crystals
• Small anisotropy of the lower critical field and $s_{\pm }$-wave two-gap feature in single crystal LiFeAs
• Evidence for Coexistence of Superconductivity and Magnetism in Single Crystals of Co-doped SrFe${}_2$As${}_2$

Cited by in corpus (8)

• Superconducting properties of sulfur-doped iron selenide
• Multiorbital effects on the transport and the superconducting fluctuations in LiFeAs
• Specific Heat Discontinuity, deltaC, at Tc in BaFe2(As0.7P0.3)2 - Consistent with Unconventional Superconductivity
• Anomalous superconducting state in LiFeAs implied by the ${}^{75}$As Knight shift measurement
• Hund's metal crossover and superconductivity in the 111 family of iron-based superconductors
• Absence of hexagonal to square structural transition in LiFeAs vortex matter
• Anisotropy of the superconducting fluctuations in multiband superconductors: the case of LiFeAs
• High-pressure self-flux growth and characterization of Li-deficient Li0.95FeAs single crystals