Growth, Characterization, Vortex Pinning and Vortex Flow Properties of Single Crystals of Iron Chalcogenide Superconductor FeCr${}_{0.02}$Se

Abstract

We report the growth and characterization of single crystals of iron chalcogenide superconductor FeCr${}_{0.02}$Se. There is an enhancement of the superconducting transition temperature (T${}_{\mathrm{c}}$) as compared to the T${}_{\mathrm{c}}$ of the single crystals of the parent compound Fe${}_{1+x}$Se by about 25%. The superconducting parameters such as the critical fields, coherence length, penetration depth and the Ginzburg-Landau parameter have been estimated for these single crystals. Analysis of the critical current data suggests a fluctuation in electronic mean free path induced ($\delta l$) pinning mechanism in this material. Thermally activated transport across the superconducting transition in the presence of external magnetic fields suggests a crossover from a single vortex pinning regime at low fields to a collective flux creep regime at higher magnetic fields. The nature of charge carriers in the normal state estimated from the Hall effect and thermal transport measurements could provide crucial information on the mechanism of superconductivity in Fe-based materials.

2 additional figures, additional discussion on nature of charge carriers

References in corpus (18)

• Superconductivity at 36 K in beta-Fe1.01Se with the compression of the interlayer separation under pressure
• Density functional study of FeS, FeSe and FeTe: Electronic structure, magnetism, phonons and superconductivity
• Superconductivity at 27 K in tetragonal FeSe under high pressure
• Extreme Sensitivity of Superconductivity to Stoichiometry in FeSe (Fe1+dSe)
• Superconductivity close to magnetic instability in Fe(Se1-xTex)0.82
• Tellurium substitution effect on superconductivity of the alpha-phase Iron Selenide
• Substitution Effects on FeSe Superconductor
• Superconductivity at 32 K in single crystal Rb${}_{0.78}$Fe${}_2$Se${}_{1.78}$}
• Theoretical evidence for strong correlations and incoherent metallic state in FeSe
• Progress in wire fabrication of iron-based superconductors
• High temperature superconductivity (Tc onset at 34K) in the high pressure orthorhombic phase of FeSe
• Critical fields, thermally-activated transport and critical current density of beta-FeSe single crystals
• Synthesis, crystal structure and magnetism of beta-Fe1.00(2)Se1.00(3) single crystals
• Effects of excess Fe on upper critical field and magnetotransport in Fe1+y(Te1-xSx)z
• Improvement of superconducting properties of FeSe0.5Te0.5 single crystals by Mn substitution
• Enhanced superconducting properties in FeCr${}_x$Se
• Uniform Patterns of Fe Vacancy Ordering in the Kx(Fe,Co)2-ySe2 Superconductors
• Evolution in the split-peak structure across the Peak Effect region in single crystals of $2H$-NbSe${}_2$

Cited by in corpus (3)

• Effect of nominal substitution of transition metals for excess Fe in Fe_{1+x}Se superconductor
• Robustness of superconducting properties to transition metal substitution and impurity phases in Fe1-xVxSe
• The Anisotropy of Thermal Activation Energy of 2H-NbS${}_2$