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Magnetic and structural properties near the Lifshitz point in Fe 1+xTe

Rodriguez, E.E., Sokolov, D.A., Stock, C., Green, M.A., Sobolev, O., Rodriguez-Rivera, J.A., Cao, H., Daoud-Aladine, A. (2013) Magnetic and structural properties near the Lifshitz point in Fe 1+xTe. Physical Review B - Condensed Matter and Materials Physics, 88 (16). 0-0. ISSN 1098-0121. (doi:10.1103/PhysRevB.88.165110) (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)

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Official URL
http://dx.doi.org/10.1103/PhysRevB.88.165110

Abstract

We construct a phase diagram of the parent compound Fe1+xTe as a function of interstitial iron x in terms of the electronic, structural, and magnetic properties. For a concentration of x<10%, Fe1+xTe undergoes a "semimetal" to metal transition at approximately 70 K that is also first-order and coincident with a structural transition from a tetragonal to a monoclinic unit cell. For x?14%, Fe1+xTe undergoes a second-order phase transition at approximately 58 K corresponding to a semimetal to semimetal transition along with a structural orthorhombic distortion. At a critical concentration of x?11%, Fe1+xTe undergoes two transitions: the higher-temperature one is a second-order transition to an orthorhombic phase with incommensurate magnetic ordering and temperature-dependent propagation vector, while the lower-temperature one corresponds to nucleation of a monoclinic phase with a nearly commensurate magnetic wave vector. While both structural and magnetic transitions display similar critical behavior for x<10% and near the critical concentration of x?11%, samples with large interstitial iron concentrations show a marked deviation between the critical response indicating a decoupling of the order parameters. Analysis of temperature dependent inelastic neutron data reveals incommensurate magnetic fluctuations throughout the Fe1+xTe phase diagram are directly connected to the "semiconductor"-like resistivity above TN and implicates scattering from spin fluctuations as the primary reason for the semiconducting or poor metallic properties. The results suggest that doping driven Fermi surface nesting maybe the origin of the gapless and incommensurate spin response at large interstitial concentrations.

Item Type: Article
DOI/Identification number: 10.1103/PhysRevB.88.165110
Additional information: Unmapped bibliographic data: C7 - 165110 [EPrints field already has value set] LA - English [Field not mapped to EPrints] J2 - Phys. Rev. B Condens. Matter Mater. Phys. [Field not mapped to EPrints] AD - Department of Chemistry of Biochemistry, University of Maryland, College Park, MD 20742, United States [Field not mapped to EPrints] AD - School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom [Field not mapped to EPrints] AD - School of Physical Sciences, University of Kent, Canterbury, CT2 7NH, United Kingdom [Field not mapped to EPrints] AD - Forschungs-Neutronenquelle Heinz Maier-Leibnitz, FRM2, Garching, 85747, Germany [Field not mapped to EPrints] AD - NIST Center for Neutron Research, National Institute of Standards and Technology, 100 Bureau Dr., Gaithersburg, MD 20889, United States [Field not mapped to EPrints] AD - Department of Materials Science, University of Maryland, College Park, MD 20742, United States [Field not mapped to EPrints] AD - Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States [Field not mapped to EPrints] AD - ISIS Facility, Rutherford Appleton Laboratory, Didcot, United Kingdom [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
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 11:10 UTC
Last Modified: 29 May 2019 16:08 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/50957 (The current URI for this page, for reference purposes)
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