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

Abstract

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).

8 pages, 11 figures

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Cited by in corpus (13)

• Nematicity, magnetism and superconductivity in FeSe
• Temperature dependence of lower critical field Hc1(T) shows nodeless superconductivity in FeSe
• Critical fields, thermally-activated transport and critical current density of beta-FeSe single crystals
• Multiband effects on beta-FeSe single crystals
• Room temperature local nematicity in FeSe superconductor
• Flux-free growth of large superconducting crystal of FeSe by traveling-solvent floating-zone technique
• Transport and pinning properties of Ag-doped FeSe0.94
• Robustness of superconductivity to competing magnetic phases in tetragonal FeS
• Photoinduced ultrafast dynamics of local nematicity and lattice distortions in FeSe crystals
• Superconducting properties of novel BiSe${}_2$-based layered LaO${}_{1-x}$F${}_x$BiSe${}_2$ single crystals
• Magnetic neutron scattering studies on the Fe-based superconductor system Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Substitution of Ni for Fe in superconducting Fe${}_{0.98}$Te${}_{0.5}$Se${}_{0.5}$ depresses the normal-state conductivity but not the magnetic spectral weight
• Growth of (NaxKy)FezSe2 crystals by chlorides flux at low temperatures