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Phase separation and suppression of the structural and magnetic transitions in superconducting doped iron tellurides, Fe1+ xTe 1-ySy

Zajdel, P., Hsieh, P.-Y., Rodriguez, E.E., Butch, N.P., Magill, J.D., Paglione, J., Zavalij, P., Suchomel, M.R., Green, M.A. (2010) Phase separation and suppression of the structural and magnetic transitions in superconducting doped iron tellurides, Fe1+ xTe 1-ySy. Journal of the American Chemical Society, 132 (37). pp. 13000-13007. ISSN 00027863 (ISSN). (doi:10.1021/ja105279p) (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/10.1021/ja105279p

Abstract

Single crystal and powder samples of the series of iron chalcogenide superconductors with nominal composition, Fe1.15Te 1-ySy, are found to form for 0 â?¤ y â?¤ 0.15. They crystallize in the tetragonal anti-PbO structure, which is composed of layers of edge-shared Fe(Te, S)4 tetrahedra. For y = 0, Fe1+xTe (x â?? 0.12(1)) is nonsuperconducting and undergoes a tetragonal (P4/nmm) to monoclinic (P21/m) structural transition at â?¼65 K, associated with the onset of commensurate antiferromagnetic order at q = (0.5 0 0.5). We show that on sulfur substitution, Fe1+xTe1-ySy becomes orthorhombic (Pmmn) at low temperature for 0 â?¤ y â?¤ 0.015, where the greatly suppressed magnetic scattering is now incommensurate at q = (0.5-δ 0 0.5) and possesses short ranged magnetic correlations that are well fitted with a two-dimensional Warren peak shape. At much higher concentrations of S (y â?¤ 0.075), there is suppression of both the structural and magnetic transitions and a superconducting transition at 9 K is observed. Between these two composition regimes, there exists a region of phase separation (0.025 â?¤ y â?¤ 0.05), where the low temperature neutron diffraction data is best refined with a model containing both the tetragonal and orthorhombic phases. The increase in the amount of sulfur is found to be associated with a reduction in interstitial iron, x. Microprobe analysis of a single crystal of composition Fe1.123(5)Te0.948(4)S0.052(4) confirms the presence of compositional variation within the crystals, rationalizing the observed phase separation. © 2010 American Chemical Society.

Item Type: Article
DOI/Identification number: 10.1021/ja105279p
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - J. Am. Chem. Soc. [Field not mapped to EPrints] AD - NIST Center for Neutron Research, NIST, 100 Bureau Drive, Gaithersburg, MD 20878, United States [Field not mapped to EPrints] AD - Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, United States [Field not mapped to EPrints] AD - Center for Nanophysics and Advance Materials, University of Maryland, College Park, MD 20742, United States [Field not mapped to EPrints] AD - Center for Chemistry, University of Maryland, College Park, MD 20742, United States [Field not mapped to EPrints] AD - Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, United States [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Antiferromagnetic orders, Compositional variation, Interstitial iron, Low temperatures, Magnetic correlation, Magnetic scattering, Magnetic transitions, Microprobe analysis, Neutron diffraction data, Nominal composition, Orthorhombic phasis, Peak shapes, Single-crystal and powder, Structural transitions, Superconducting transitions, Antiferromagnetism, Lead oxide, Single crystals, Sulfur, Superconducting magnets, Superconductivity, Tellurium compounds, Phase separation, iron derivative, sulfur, article, chemical composition, chemical structure, crystallization, electric conductivity, low temperature, magnetism, neutron diffraction, phase separation, substitution reaction
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: 15 Oct 2015 11:17 UTC
Last Modified: 29 May 2019 16:09 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/50997 (The current URI for this page, for reference purposes)
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