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The nuclear and magnetic structure of Fe1+y(Te1-x,Sex) (0 < x < 0.20)compounds was analyzed between 2 K and 300 K by means of Rietveld refinement ofneutron powder diffraction data. Samples with x < 0.075 undergo a tetragonal tomonoclinic phase transition at low temperature, whose critical temperaturedecreases with increasing Se content; this structural transition is strictlycoupled to a long range antiferromagnetic ordering at the Fe site. Both thetransition to a monoclinic phase and the long range antiferromagnetism aresuppressed for 0.10 < x < 0.20. The onset of the structural and of the magnetictransition remains coincident with the increase of Se substitution. The lowtemperature monoclinic crystal structure has been revised. Superconductivityarises for x > 0.05, therefore a significant region where superconductivity andlong range antiferromagnetism coexist is present in the pseudo-binary FeTe -FeSe phase diagram.

From antiferromagnetism to superconductivity in Fe 1+y(Te1-x,Sex) (0 < x < 0.20): a neutron powder diffraction analysis