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

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

2011-07-07

arxiv.org/abs/1107.1496v1

Phys. Rev. B 83, 224502 (2011)

Physics

Condensed Matter

Superconductivity

8 pages, 11 figures

Scientific paper

10.1103/PhysRevB.83.224502

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

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