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Iron-chalcogenide single crystals with the nominal compositionFeSe$_{0.5}$Te$_{0.5}$ and a transition temperature of $T_{c}\simeq14.6$ K weresynthesized by the Bridgman method. The structural and anisotropicsuperconducting properties of those crystals were investigated by means ofsingle crystal X-ray and neutron powder diffraction, SQUID and torquemagnetometry, and muon-spin rotation. Room temperature neutron powderdiffraction reveals that 95% of the crystal volume is of the same tetragonalstructure as PbO. The structure refinement yields a stoichiometry ofFe_1.045Se_0.406Te_0.594. Additionally, a minor hexagonal Fe_7Se_8 impurityphase was identified. The magnetic penetration depth \lambda at zerotemperature was found to be 491(8) nm in the ab-plane and 1320(14) nm along thec-axis. The zero-temperature value of the superfluid density \rho_s(0)\lambda^-2(0) obeys the empirical Uemura relation observed for variousunconventional superconductors, including cuprates and iron-pnictides. Thetemperature dependences of both \lambda_ab and \lambda_c are well described bya two-gap s+s-wave model with the zero-temperature gap values of\Delta_S(0)=0.51(3) meV and \Delta_L(0)=2.61(9) meV for the small and the largegap, respectively. The magnetic penetration depth anisotropy parameter\gamma_\lambda(T)=\lambda_c(T)/\lambda_{ab}(T) increases with decreasingtemperature, in agreement with \gamma_\lambda(T) observed in the iron-pnictidesuperconductors.

Anisotropic superconducting properties of single-crystalline FeSe0.5Te0.5