  In this review, we present a summary of the results on single crystal growth
of two types of iron-chalcogenide superconductors, Fe(1+y)Te(1-x)Se(x) (11),
and A(x)Fe(2-y)Se(2) (A= K, Rb, Cs, Tl, Tl/K, Tl/Rb), using Bridgman,
zone-melting, vapor self-transport, and flux techniques. The superconducting
and magnetic properties (the latter gained mainly from neutron scattering
measurements) of these materials are reviewed to demonstrate the connection
between magnetism and superconductivity. It will be shown that for the 11
system, while static magnetic order around the reciprocal lattice position
(0.5, 0) competes with superconductivity, spin excitations centered around
(0.5, 0.5) are closely coupled to the materials' superconductivity; this is
made evident by the strong correlation between the spectral weight around (0.5,
0.5) and the superconducting volume fraction. The observation of a spin
resonance below the superconducting temperature, Tc, and the magnetic-field
dependence of the resonance, emphasize the important role spin excitations play
in the superconductivity. Generally, these results illustrate the similarities
between the iron-based and cuprate superconductors. In A(x)Fe(2-y)Se(2),
superconductivity with Tc ~ 30 K borders an antiferromagnetic insulating phase;
this is closer to the behavior observed in the cuprates but differs from that
in other iron-based superconductors.
