Upper critical fields and superconducting anisotropy of K0.70Fe1.55Se1.01S0.99 and K0.76Fe1.61Se0.96S1.04 single crystals

Abstract

We have investigated temperature and angular dependence of resistivity of K0.70(7)Fe1.55(7)Se1.01(2)S0.99(2) and K0.76(5)Fe1.61(5)Se0.96(4)S1.04(5) single crystals. The upper critical fields Hc2(T) for both field directions decrease with the increase in S content. On the other hand, the angle-dependent magnetoresistivity for both compounds can be scaled onto one curve using the anisotropic Ginzburg-Landau theory. The obtained anisotropy of Hc2(T) increases with S content, implying that S doping might decrease the dimensionality of certain Fermi surface parts, leading to stronger two dimensional character.

5 pages, 6 figures

References in corpus (18)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• The superconductivity at 18 K in LiFeAs system
• Very High Field Two-Band Superconductivity in LaFeAsO_0.89F_0.11
• Fe-based high temperature superconductivity with Tc=31K bordering an insulating antiferromagnet in (Tl,K)FexSe2 Crystals
• Upper critical fields and thermally-activated transport of Nd(O_0.7F_0.3)FeAs single crystal
• Superconductivity at 32 K in single crystal Rb${}_{0.78}$Fe${}_2$Se${}_{1.78}$}
• Synthesis and crystal growth of Cs0.8(FeSe0.98)2: a new iron-based superconductor with Tc=27K
• Upper critical field, anisotropy, and superconducting properties of Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ single crystals
• The effect of varying Fe-content on transport properties of K intercalated iron selenide KxFe2-ySe2
• Transport properties of the new Fe-based superconductor KxFe2Se2 (Tc = 33 K)
• Transport properties and anisotropy of Rb0.8Fe2Se2 single crystals
• Psuedo-isotropic upper critical field in cobalt-doped SrFe2As2 epitaxial films
• Superconductivity and Magnetic Properties of high-quality single crystals of $A_x$Fe${}_2$Se${}_2$ ($A$ = K and Cs)
• High-Field Pauli-Limiting Behavior and Strongly Enhanced Upper Critical Magnetic Fields near the Transition Temperature of an Arsenic-Deficient LaO_0.9F_0.1FeAs_(1-δ) Superconductor
• Superconductivity at 23 K and Low Anisotropy in Rb-Substituted BaFe_2As_2 Single Crystals
• Anisotropic Hc2 of K0.8Fe1.76Se2 determined up to 60 T
• Spin glass behavior of insulating K0.8Fe2-xS2
• Effects of excess Fe on upper critical field and magnetotransport in Fe1+y(Te1-xSx)z

Cited by in corpus (5)

• Orbital upper critical field of type-II superconductors with pair breaking
• Upper critical field and thermally activated flux flow in single crystalline Tl${}_{0.58}$Rb${}_{0.42}$Fe${}_{1.72}$Se${}_2$
• Evolution of the Pauli spin-paramagnetic effect on the upper critical fields of K${}_x$Fe${}_{2-y}$Se${}_{2-z}$S${}_z$ single crystals
• NMR Characterization of Sulphur Substitution Effects in the K(x)Fe(2-y)Se(2-z)S(z) high Tc Superconductor
• Multiband behavior and non-metallic low-temperature state of K${}_{0.50}$Na${}_{0.24}$Fe${}_{1.52}$Se${}_2$