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Chemical Science Vol - 2 Issue - 8

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Chemical Science Vol -1

Chemical control of interstitial iron leading to superconductivity in Fe_1+xTe_0.7Se_0.3

Content Provider	Royal Society of Chemistry (RSC)
Author	Rodriguez, Efrain E. Green, Mark A. Butch, Nicholas P. Stock, Christopher Paglione, Johnpierre Hsieh, Ping-Yen
Copyright Year	2011
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.
Starting Page	1782
Ending Page	1787
Page Count	6
File Format	HTM / HTML PDF
ISSN	20416520
Volume Number	2
Issue Number	9
Journal	Chemical Science
DOI	10.1039/c1sc00114k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Tetrahedron Phase diagram Neutron diffraction Tetragonal crystal system Superconductivity Inelastic neutron scattering Paramagnetism Topology Correlation and dependence Iodine Crystal structure
Content Type	Text
Resource Type	Article
Subject	Chemistry

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