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Coexistence of incommensurate magnetism and superconductivity inFe1+ySexTe1−x
Journal article published in 2009 by
R. Khasanov 
,
M. Bendele,
A. Amato,
P. Babkevich,
A. T. Boothroyd,
A. Cervellino ,
K. Conder,
S. N. Gvasaliya,
H. Keller,
H.-H. Klauss,
H. Luetkens,
V. Pomjakushin,
E. Pomjakushina,
B. Roessli
,
M. Bendele,
A. Amato,
P. Babkevich,
A. T. Boothroyd,
A. Cervellino ,
K. Conder,
S. N. Gvasaliya,
H. Keller,
H.-H. Klauss,
H. Luetkens,
V. Pomjakushin,
E. Pomjakushina,
B. Roessli
Abstract
We have studied the superconducting and magnetic properties of Fe1+ySexTe1−x single crystals (0≤x≤0.5) by magnetic susceptibility, muon-spin rotation, and neutron diffraction. We find three regimes of behavior: (i) commensurate magnetic order for x≲0.1, (ii) bulk superconductivity for x∼0.5, and (iii) a range x≈0.25–0.45 in which superconductivity coexists with incommensurate magnetic order. The results are qualitatively consistent with two-band mean-field models in which itinerant magnetism and extended s-wave superconductivity are competing order parameters.