Istituto dei materiali per l'elettronica ed il magnetismo     
Martinelli A., Palenzona A., Tropeano M., Ferdeghini C., Putti M., Cimberle M. R., Nguyen T., Affronte M., Ritter C. From antiferromagnetism to superconductivity in Fe1+y(Te1-x,Sex) (0≤ x ≤ 0.20): Neutron powder diffraction analysis. In: Physical Review B, vol. 81 article n. 094115. APS, 2010.
The nuclear and magnetic structure of Fe1+y(Te1-x,Sex) (0≤ x ≤ 0.20) compounds were analyzed between 2 K and 300 K by means of Rietveld refinement of neutron powder diffraction data. The samples with x ≤ 0.075 undergo a tetragonal to monoclinic phase transition at low temperature, whose critical temperature decreases with the increase of Se content; this structural transition is strictly coupled with a long range antiferromagnetic ordering at Fe site. Both monoclinic phase and long range antiferromagnetism are suppressed for 0.10 ≤ x ≤ 0.20. The onsets of the structural and magnetic transitions remain coincident with the increase of Se substitution. The low temperature monoclinic crystal structure has been revised. Superconductivity arises for x ≤ 0.05, therefore a significant region where superconductivity and long range antiferromagnetism coexist is present in the pseudo-binary FeTe - FeSe phase diagram.
Subject Neutron powder diffraction, iron based superconductor
61.05.F-; 74.70.Xa;74.62.Dh;65.40.Ba

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