Transition-Metal Substitutions in Iron Chalcogenides

Abstract

The $ab$-plane resistivity and Hall effect are studied in Fe${}_{1-y}$M${}_y$Te${}_{0.65}$Se${}_{0.35}$ single crystals doped with two transition metal elements, M = Co or Ni, over a wide doping range, $0\le y\le 0.2$. The superconducting transition temperature, $T_c$, reaches zero for Co at $y\simeq 0.14$ and for Ni at $y\simeq 0.032$, while the resistivity at the $T_c$ onset increases weakly with Co doping, and strongly with Ni doping. The Hall coefficient $R_H$, positive for $y$ = 0, remains so at high temperatures for all $y$, while it changes sign to negative at low $T$ for $y>0.135$ (Co) and $y>0.06$ (Ni). The analysis based on a two band model suggests that at high $T$ residual hole pockets survive the doping, but holes get localized upon the lowering of $T$, so that the effect of the electron doping on the transport becomes evident. The suppression of the $T_c$ by Co impurity is related to electron doping, while in case of the Ni impurity strong electron localization most likely contributes to fast decrease of the $T_c$.

References in corpus (26)

• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• Superconductivity in Iron Compounds
• Gap symmetry and structure of Fe-based superconductors
• Incommensurate magnetic order in the alpha-Fe(Te,Se) superconductor systems
• Bulk Superconductivity at 14 K in Single Crystals of Fe1+yTexSe1-x
• FeAs-based superconductivity: a case study of the effects of transition metal doping on BaFe2As2
• 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
• Role of multiband effects and electron-hole asymmetry in the superconductivity and normal state properties of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Superconductivity at T_c ~ 14 K in Single Crystalline FeTe${}_{0.61}$Se${}_{0.39}$
• Importance of Fermi surface topology for high temperature superconductivity in electron-doped iron arsenic superconductors
• Do Transition Metal Substitutions Dope Carriers in Iron Based Superconductors?
• Interplay between magnetism and superconductivity in iron-chalcogenide superconductors: crystal growth and characterizations
• Electronic structure of Fe1.04(Te0.66Se0.34)
• The Stoichiometry of FeSe
• Superconductivity suppression of Ba0.5K0.5Fe2-2xM2xAs2 single crystals by substitution of transition-metal (M = Mn, Ru, Co, Ni, Cu, and Zn)
• Growth conditions, structure, and superconductivity of pure and metal-doped FeTe1-xSex single crystals
• Multiband Effect and Possible Dirac Fermions in Fe${}_{1+y}$Te${}_{0.6}$Se${}_{0.4}$
• Effect of electron irradiation on superconductivity in single crystals of Ba(Fe${}_{1-x}$Ru${}_x$)${}_2$As${}_2$ ($x=$0.24)
• Friedel-like Oscillations from Interstitial Iron in Superconducting Fe1+yTe0.62Se0.38
• Microstructural magnetic phases in superconducting FeTe0.65Se0.35
• Coupling of electronic and magnetic properties in Fe1+y(Te1-xSex)
• Different effects of Ni and Co substitution on the transport properties of BaFe2As2
• Effect of Co Impurities on Superconductivity of FeSe0.4Te0.6 single crystals
• Doping effects of Co, Ni, and Cu in FeTe0.65Se0.35 single crystals
• Superconducting Symmetry Studied from Impurity Effects in Single-Crystal Fe1-yMySe0.3Te0.7 (M = Co, Ni, Zn)

Cited by in corpus (2)

• Effect of electron doping in FeTe${}_{1-y}$Se${}_y$ realized by Co and Ni substitution
• Evolution of the intertwining correlated topological phases in iron-based superconductor Fe(Te,Se)