Evolution of superconducting and transport properties in annealed FeTe${}_{1-x}$Se${}_x$ (0.1 $\le$ $x$ $\le$ 0.4) multiband superconductors

Abstract

We investigated the superconducting and transport properties in FeTe${}_{1-x}$Se${}_x$ (0.1 $\le$ $x$ $\le$ 0.4) single crystals prepared by O${}_2$-annealing. Sharp superconducting transition width observed in magnetization measurement and the small residual resistivity prove the high quality of the crystals. All the crystals manifest large, homogeneous, and isotropic critical current density \emph{J}${}_c$ with self-field value over 10${}^5$ A/cm${}^2$ at 2 K. The large and field-robust critical current densities prove that the superconductivity in FeTe${}_{1-x}$Se${}_x$ (0.1 $\le$ $x$ $\le$ 0.4) is in bulk nature. The values of anisotropy parameter close to $T_c$ for crystals with different Se doping levels all reside in the range of 2 - 3. Hall coefficients $R_H$ keeps positive and almost constant value at high temperatures, followed by a sudden decreases before reaching $T$${}_c$, which indicates that the electron-type charge carriers become dominant at low temperatures. Furthermore, the characteristic temperature for the sudden decrease in $R_H$ gradually increases with Se doping.

arXiv comment12 pages, 7 figures. Invited paper to Supercond. Sci. Technol. (special issue for Multicomponent Superconductivity)

References in corpus (28)

• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• Superconductivity in Iron Compounds
• Density functional study of FeS, FeSe and FeTe: Electronic structure, magnetism, phonons and superconductivity
• Incommensurate magnetic order in the alpha-Fe(Te,Se) superconductor systems
• Orbital Fluctuation Mediated Superconductivity in Iron Pnictides: Analysis of Five Orbital Hubbard-Holstein Model
• Bulk Superconductivity at 14 K in Single Crystals of Fe1+yTexSe1-x
• From (pi, 0) magnetic order to superconductivity with (pi, pi) magnetic resonance in Fe1.02(Te1-xSex)
• Charge carrier localization induced by excess Fe in the Fe1+y(Te,Se) superconductor system
• Fermi surface topology and low-lying quasiparticle dynamics of parent Fe${}_{1+x}$Te/Se Superconductor by orbital-polarization resolved ARPES
• Superconductivity at T_c ~ 14 K in Single Crystalline FeTe${}_{0.61}$Se${}_{0.39}$
• Fermi surface topology and low-lying quasiparticle structure of magnetically ordered Fe1+xTe
• Anisotropy of the Optimally-Doped Iron Pnictide Superconductor Ba(Fe0.926Co0.074)2As2
• Density Functional Study of Excess Fe in Fe${}_{1+x}$Te: Magnetism and Doping
• Isotropic superconducting gaps with enhanced pairing on electron Fermi surfaces in FeTe0.55Se0.45
• Electronic structure of Fe1.04(Te0.66Se0.34)
• Tuning the superconducting and magnetic properties in Fe_ySe_0.25Te_0.75 by varying the Fe-content
• Revised Phase Diagram for FeTe1-xSex system with less excess Fe atoms
• Dynamics and mechanism of oxygen annealing in Fe${}_{1+y}$Te${}_{0.6}$Se${}_{0.4}$ single crystal
• Anisotropic Structure of the Order Parameter in FeSe0.45Te0.55 Revealed by Angle Resolved Specific Heat
• Multiband Effect and Possible Dirac Fermions in Fe${}_{1+y}$Te${}_{0.6}$Se${}_{0.4}$
• A comprehensive scenario of the single crystal growth and doping dependence of resistivity and anisotropic upper critical fields in (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$ ($0.22\le x\le 1$)
• Hall effect in superconducting Fe(Se0.5Te0.5) thin films
• Muon-spin-spectroscopy study of the penetration depth of FeTe0.5Se0.5
• Evolution of transport properties of BaFe2-xRuxAs2 in a wide range of isovalent Ru substitution
• Specific-heat study of superconducting and normal states in FeSe1-xTex (0.6<=x<=1) single crystals: Strong-coupling superconductivity, strong electron-correlation, and inhomogeneity
• Evolution of Superconductivity in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ Annealed in Te Vapor
• Bulk Superconductivity in Fe1+yTe0.6Se0.4 Induced by Removal of Excess Fe
• Possible nodal superconducting gap in Fe${}_{1+y}$(Te${}_{1-x}$Se${}_x$) single crystals from ultra-low temperature penetration depth measurements

Cited by in corpus (9)

• Non-Thermal Emergence of an Orbital-Selective Mott Phase in FeTe${}_{1-x}$Se${}_x$
• Correlation-Driven Electronic Reconstruction in FeTe${}_{1-x}$Se${}_x$
• Influence of interstitial Fe to the phase diagram of Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ single crystals
• Achieving the depairing limit along $c$ axis in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ single crystals
• Incoherent-coherent crossover and the pseudogap in Te-annealed superconducting Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ revealed by magnetotransport measurements
• Electronic transport properties and hydrostatic pressure effect of FeSe${}_{0.67}$Te${}_{0.33}$ single crystals free of phase separation
• Thermal evolution of antiferromagnetic correlations and tetrahedral bond angles in superconducting FeTe${}_{1-x}$Se${}_x$
• Significant enhancement of critical current density in H+-intercalated FeSe single crystal
• FeTe${}_{0.55}$Se${}_{0.45}$ van der Waals Tunneling Devices