The superconductor KxSr(1-x)Fe2As2: Normal state and superconducting properties

Abstract

The normal state and superconducting properties are investigated in the phase diagram of K_xSr_{1-x}Fe_2As_2 for 0<x<1. The ground state upper critical field, H_{c2}(0), is extrapolated from magnetic field dependent resistivity measurements. H_{c2}(0) scales with the critical temperature, T_c, of the superconducting transition. In the normal state the Seebeck coefficient is shown to experience a dramatic change near a critical substitution of x=0.3. This is associated with the formation of a spin density wave state above the superconducting transition temperature. The results provide strong evidence for the reconstruction of the Fermi surface with the onset of magnetic order.

Published in New Journal of Physics (Focus issue on iron-based superconductors)

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Cited by in corpus (15)

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• Possible Multiple Gap Superconductivity with Line Nodes in Heavily Hole-Doped Superconductor KFe2As2 Studied by 75As-NQR and Specific Heat
• High Pressure Studies on Fe-Pnictide Superconductors
• Transport properties and asymmetric scattering in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ single crystals compared to the electron doped counterparts Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$}
• Transport and superconducting properties of Fe-based superconductors: SmFeAs(O1-x Fx) versus Fe1+y (Te1-x, Sex)
• Seebeck effect in Fe1+xTe1-ySey single crystals
• Thermoelectric properties of iron-based superconductors and parent compounds
• High Pressure Synthesis of Indirectly electron-doped 122 Iron Superconductor Sr1-xLaxFe2As2 with a maximum Tc = 22 K
• Signatures of quantum criticality in hole-doped and chemically pressurized EuFe_2As_2 single crystals
• Doping dependent evolution of magnetism and superconductivity in Eu1-xKxFe2As2 (x = 0-1) and temperature dependence of lower critical field Hc1
• Doping-induced superconductivity in the topological semimetal Mo5Si3
• High-pressure study of superconducting and non-superconducting single crystals of the same nominal composition Rb0.8Fe2Se2
• Phase diagram of the NdFe1-xRhxAsO superconductor
• Quantum-critical resistivity of strange metals in a magnetic field