Phys. Rev. Lett. 102, 247001 (2009) [4 pages]Tunable (δπ, δπ)-Type Antiferromagnetic Order in α-Fe(Te,Se) SuperconductorsReceived 29 September 2008; published 17 June 2009 The new α-Fe(Te,Se) superconductors share the common iron building block and ferminology with the LaFeAsO and BaFe2As2 families of superconductors. In contrast with the predicted commensurate spin-density-wave order at the nesting wave vector (π, 0), a completely different magnetic order with a composition tunable propagation vector (δπ, δπ) was determined for the parent compound Fe1+yTe in this powder and single-crystal neutron diffraction study. The new antiferromagnetic order survives as a short-range one even in the highest TC sample. An alternative to the prevailing nesting Fermi surface mechanism is required to understand the latest family of ferrous superconductors. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.247001
DOI:
10.1103/PhysRevLett.102.247001
PACS:
74.25.Ha, 61.05.fm, 74.70.−b, 75.30.Fv
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