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• A complete Co doping range up to its solid solubility limit in FeSe have been successfully grown. • The typical lateral size of Fe 1-x Co x Se single crystals is 1–5 mm. • All the samples show metalic behaviour in contrast to a metal insulator transition of Cu doped FeSe. A series of tetragonal Fe 1-x Co x Se single crystals with a complete Co doping range (0 ≤ x ≤ 0.52) up to its solid solubility limit in FeSe have been grown by an eutectic AlCl 3 /KCl molten salt method. The typical lateral size of as-grown Fe 1-x Co x Se single crystals is 1–5 mm. The chemical composition and homogeneity of the crystals was examined by both inductively coupled plasma atomic emission spectroscopy and energy dispersive spectrometer. X-ray diffraction analysis demonstrates that the crystal lattice parameters a and c are both linearly decreased with increasing Co doping level x. In the whole doping range, all the samples show metallic behaviour in contrast to a metal insulator transition of Cu-doped FeSe according to the resistivity measurements. [ABSTRACT FROM AUTHOR]

• The composition homogeneous CuFeSe 2 single crystals with 1.6 × 1.2 × 1.0 mm3 in size are successfully grown. • The intrinsic ferrimagnetic transition occurs below T C = 146 K without other magnetic impurity interference. • An abrupt increase of resistivity below T C revealing a semiconducting behavior. An eutectic AlCl 3 /KCl molten salt method in a horizontal configuration was employed to grow millimeter-sized and composition homogeneous CuFeSe 2 single crystals due to the continuous growth process in a temperature gradient induced solution convection. The typical as-grown CuFeSe 2 single crystals in cubic forms are nearly 1.6 × 1.2 × 1.0 mm3 in size. The chemical composition and homogeneity of the crystals was examined by both inductively coupled plasma atomic emission spectroscopy and energy dispersive spectrometer with Cu:Fe:Se = 0.96:1.00:1.99 consistent with the stoichiometric composition of CuFeSe 2. The magnetic measurements suggest a ferrimagnetic or weak ferromagnetic transition below T C = 146 K and the resistivity reveals a semiconducting behavior and an abrupt increase below T C. [ABSTRACT FROM AUTHOR]