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Chemical control of interstitial iron leading to superconductivity in Fe 1+xTe 0.7Se 0.3

Rodriguez, E.E., Stock, C., Hsieh, P.-Y., Butch, N.P., Paglione, J., Green, M.A. (2011) Chemical control of interstitial iron leading to superconductivity in Fe 1+xTe 0.7Se 0.3. Chemical Science, 2 (9). pp. 1782-1787. ISSN 2041-6520. (doi:10.1039/c1sc00114k) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
http://dx.doi.org/10.1039/c1sc00114k

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 Fe 1+xTe 0.7Se 0.3 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. © The Royal Society of Chemistry 2011.

Item Type: Article
DOI/Identification number: 10.1039/c1sc00114k
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - Chem. Sci. [Field not mapped to EPrints] AD - NIST Center for Neutron Research, NIST, Gaithersburg, MD 20899, United States [Field not mapped to EPrints] AD - Indiana University, 2401 Milo B. Sampson Lane, Bloomington, IN 47408, United States [Field not mapped to EPrints] AD - Department of Materials Science and Engineering, University of Maryland, College Park 20742, United States [Field not mapped to EPrints] AD - Center for Nanophysics and Advanced Materials, University of Maryland, College Park, MD 20742, United States [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Chemical controls, Deintercalation, Interstitial iron, Lattice strain, Magnetic phase diagrams, Powder neutron diffraction, Temperature dependence, Iodine, Iron, Magnetic properties, Paramagnetism, Phase diagrams, Superconductivity, Iron compounds
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Q Science > QD Chemistry > QD478 Solid State Chemistry
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Giles Tarver
Date Deposited: 14 Oct 2015 10:47 UTC
Last Modified: 29 May 2019 16:08 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/50973 (The current URI for this page, for reference purposes)
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