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

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arxiv 1107.1496 v1 pith:4ENNFZI2 submitted 2011-07-07 cond-mat.supr-con cond-mat.mtrl-sci

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

Rongwei Hu , Hechang Lei , Milinda Abeykoon , Emil S. Bozin , Simon J. L. Billinge , J. B. Warren , Theo Siegrist , C. Petrovic This is my paper
classification cond-mat.supr-con cond-mat.mtrl-sci
keywords crystalssinglebeenbeta-feseimpuritysuperconductorsbelowbeta-fe1
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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