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Understanding iron based superconductors requires high quality impurity freesingle crystals. So far they have been elusive for beta-FeSe and extraction ofintrinsic materials properties has been compromised by several magneticimpurity phases. Herein we report synchrotron - clean beta-FeSe superconductingsingle crystals grown via LiCl/CsCl flux method. Phase purity yields evidencefor a defect induced weak ferromagnetism that coexists with superconductivitybelow Tc. In contrast to Fe1+yTe - based superconductors, our results revealthat the interstitial Fe(2) site is not occupied and that all contribution todensity of states at the Fermi level must come from in-plane Fe(1).

Synthesis, crystal structure and magnetism of beta-Fe1.00(2)Se1.00(3) single crystals