Anisotropic resistivity of Na${}_{1-\delta }$Fe${}_{1-x}$Co${}_x$As

Abstract

Temperature-dependent resistivity is studied in single crystals of iron-arsenide superconductor Na${}_{1-\delta }$Fe${}_{1-x}$Co${}_x$As for electrical current directions along, ${\rho }_a(T)$, and transverse, ${\rho }_c(T)$, to the Fe-As layers. Doping with Co increases stability of this compound to reaction with the environment and suppresses numerous features in both ${\rho }_a(T)$ and ${\rho }_c(T)$ compared to the stoichiometric NaFeAs. Evolution of ${\rho }_a(T)$ with $x$ follows a universal trend observed in other pnictide superconductors, exhibiting a $T$-linear temperature dependence close to the optimal doping and development of $T^2$ dependence upon further doping. ${\rho }_c(T)$ in parent compound shows a non - monotonic behavior with a crossover from non-metallic resistivity increase on cooling from room temperature down to $\sim$ 80 K to a metallic decrease below this temperature. Both ${\rho }_a(T)$ and ${\rho }_c(T)$ show several correlated crossover - like features at $T>$ 80 K. Despite a general trend towards more metallic behavior of inter - plane resistivity in Co-doped samples, the temperature of the crossover from insulating to metallic behavior (80 K) does not change much with doping.

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• A crossover in phase diagram of NaFe${}_{1-x}$Co${}_x$As determined by electronic transport measurements
• The upper critical field of NaFe${}_{1-x}$Co${}_x$As superconductors
• Temperature-concentration phase diagram of (Ca1-xLax)10(Pt3As8)(Fe2As2)5 superconductors
• Interplane resistivity of underdoped single crystals (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$, $0\le x<0.34$
• Inter-plane resistivity of isovalent doped BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Crystal growth and the electronic phase diagram of the 4$d$ doped Na${}_{1-\delta }$Fe${}_{1-x}$Rh${}_x$As in comparison with 3$d$ doped Na${}_{1-\delta }$Fe${}_{1-x}$Co${}_x$As
• Electron doping evolution of the magnetic excitations in NaFe${}_{1-x}$Co${}_x$As
• Electron doping evolution of the neutron spin resonance in NaFe${}_{1-x}$Co${}_x$As
• Phase diagram and neutron spin resonance of superconducting NaFe${}_{1-x}$Cu${}_x$As
• Local Structure and Hyperfine Interactions of 57Fe in NaFeAs Studied by Mossbauer Spectroscopy
• Superconductivity-induced Phonon Renormalization on NaFe${}_{1-x}$Co${}_x$As
• Temperature and polarization dependence of low-energy magnetic fluctuations in nearly-optimal-doped NaFe${}_{0.9785}$Co${}_{0.0215}$As
• Combined resistivity and Hall effect study on NaFe${}_{1-x}$Rh${}_x$As single crystals