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Issue 9, 2011
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Chemical control of interstitial iron leading to superconductivity in Fe1+xTe0.7Se0.3

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Abstract

Although it possesses the simple layered topology of the tetragonal anti-PO structure, the Fe(Te,Se) series has a complex structural and magnetic phase diagram that is dependent on composition and occupancy of a secondary interstitial Fe site. Here we show that superconductivity in Fe1+xTe0.7Se0.3 is enhanced by topotactic deintercalation of the interstitial iron with iodine, demonstrating the competing roles of the two iron positions. We follow the evolution of the structure and magnetic properties as a function of interstitial iron. Powder neutron diffraction reveals a flattening of the Fe(Te,Se)4 tetrahedron on Fe removal and an unusual temperature dependence of the lattice parameters that increases strongly below 150 K along with lattice strain. Inelastic neutron scattering shows gapless paramagnetic scattering evolves into a gapped excitation at 6 meV on removal of interstitial iron. This work highlights the robustness of the superconductivity across different Fe(Te,Se) compositions and geometries.

Graphical abstract: Chemical control of interstitial iron leading to superconductivity in Fe1+xTe0.7Se0.3

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Publication details

The article was received on 26 Feb 2011, accepted on 16 Jun 2011 and first published on 07 Jul 2011


Article type: Edge Article
DOI: 10.1039/C1SC00114K
Citation: Chem. Sci., 2011,2, 1782-1787
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    Chemical control of interstitial iron leading to superconductivity in Fe1+xTe0.7Se0.3

    E. E. Rodriguez, C. Stock, P. Hsieh, N. P. Butch, J. Paglione and M. A. Green, Chem. Sci., 2011, 2, 1782
    DOI: 10.1039/C1SC00114K

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