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From antiferromagnetism to superconductivity in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Fe</mml:mtext></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>+</mml:mo><mml:mi>y</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Te</mml:mtext></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Se</mml:mtext></mml:mrow><mml:mi>x</mml:mi></mml:msub…
The nuclear and magnetic structures of ${\text{Fe}}_{1+y}{\text{Te}}_{1\ensuremath{-}x}{\text{Se}}_{x}$ $(0\ensuremath{\le}x\ensuremath{\le}0.20)$ compounds was analyzed between 2 and 300 K by means of Rietveld refinement of neutron powder diffraction data. Samples with $x\ensuremath{\le}0.075$ undergo a tetragonal to monoclinic phase transition at low temperature, whose critical temperature decreases with increasing Se content; this structural transition …