  The effects of anneal-tuning of single-crystalline samples of CaFe$_2$As$_2$
synthesized via a molten Sn flux method are investigated using x-ray
diffraction, chemical composition, electrical transport and magnetic
susceptibility measurements in order to understand the role of growth
conditions on the resultant phase diagram. Previous studies of CaFe$_2$As$_2$
crystals synthesized using a self-flux (FeAs) method revealed an ability to
tune the structural and magnetic properties of this system by control of
post-synthesis annealing conditions, resulting in an ambient pressure phase
diagram that spans from tetragonal/orthorhombic antiferromagnetism to the
collapsed tetragonal phase of this system. In this work, we compare previous
results to those obtained on crystals synthesized via Sn flux, finding similar
tunability in both self- and Sn-flux cases, but less sensitivity to annealing
temperatures in the latter case, resulting in a temperature-shifted phase
diagram.
