Issue 9, 2011

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

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

Supplementary files

Article information

Article type
Edge Article
Submitted
26 Feb 2011
Accepted
16 Jun 2011
First published
07 Jul 2011

Chem. Sci., 2011,2, 1782-1787

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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