  We report flux free growth of superconducting FeSe single crystals by an easy
and versatile high temperature melt and slow cooling method for first time. The
room temperature XRD on the surface of the piece of such obtained crystals
showed single 101 plane of Beta-FeSe tetragonal phase. The bulk powder XRD,
being obtained by crushing the part of crystal chunk showed majority tetragonal
and minority FeSe hexagonal crystalline phases. Detailed HRTEM images along
with SAED (selected area electron diffraction) showed the abundance of both
majority and minority FeSe phases. Both transport (RT) and magnetization (MT)
exhibited superconductivity at below around 10K. Interestingly, the
magnetization signal of these crystals is dominated by the magnetism of
minority magnetic phase, and hence the isothermal magnetization (MH) at 4K was
seen to be ferromagnetic (FM) like. Transport (R-T) measurements under magnetic
field showed superconductivity onset at below 12K, and R = 0 (Tc) at 9K.
Superconducting transition temperature (Tc) decreases with applied field to
around 6K at 7Tesla, with dTc/dH of 0.4K/Tesla, giving rise to an Hc2 value of
around 50 Tesla, 30 Tesla and 20 Tesla for Rn = 90, 50 and 10 percent
respectively. FeSe single crystal activation energy is calculated from
Thermally Activated Flux Flow (TAFF) model which is found to decreases with
field.
