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Title: Effect of Fe excess on structural, magnetic and superconducting properties of single-crystalline Fe{sub 1+x}Te{sub 1-y}Se{sub y}

Abstract

Single crystals of Fe{sub 1+x}Te{sub 1-y}Se{sub y} have been grown with a controlled Fe excess and Se doping, and the crystal structure has been refined for various compositions. The systematic investigation of magnetic and superconducting properties as a function of the structural parameters shows how the material can be driven into various ground states, depending on doping and the structural modifications. Our results prove that the occupation of the additional Fe site, Fe2, enhances the spin localization. By reducing the excess Fe, the antiferromagnetic ordering is weakened, and the superconducting ground state is favored. We have found that both Fe excess and Se doping in synergy determine the properties of the material and an improved 3-dimensional phase diagram is proposed. - Single crystals of Fe{sub 1+x}Te{sub 1-y}Se{sub y} have been grown with a controlled Fe off-stoichiometry and Se doping and the crystal structure has been refined for various compositions, thus proving the effect of both Fe excess and Se-substitutions on the structural properties. Either antiferromagnetic or superconducting ground state is driven by doping and related structural modifications. An improved 3-D phase diagram is proposed.

Authors:
 [1];  [1];  [1];  [2]
  1. Departement de Physique de la Matiere Condensee, Universite de Geneve, 24 Quai Ernest-Ansermet, 1211 Geneva (Switzerland)
  2. Laboratoire de Cristallographie, Universite de Geneve, 24 Quai Ernest-Ansermet, 1211 Geneva (Switzerland)
Publication Date:
OSTI Identifier:
21372551
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 183; Journal Issue: 4; Other Information: DOI: 10.1016/j.jssc.2010.01.024; PII: S0022-4596(10)00038-1; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANTIFERROMAGNETISM; CRYSTAL STRUCTURE; GROUND STATES; IRON BASE ALLOYS; MONOCRYSTALS; PHASE DIAGRAMS; SELENIUM ALLOYS; STOICHIOMETRY; SUPERCONDUCTIVITY; SUPERCONDUCTORS; TELLURIUM ALLOYS; ALLOYS; CRYSTALS; DIAGRAMS; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; ENERGY LEVELS; INFORMATION; IRON ALLOYS; MAGNETISM; PHYSICAL PROPERTIES; TRANSITION ELEMENT ALLOYS

Citation Formats

Viennois, R, Giannini, E, Marel, D van der, and Cerny, R. Effect of Fe excess on structural, magnetic and superconducting properties of single-crystalline Fe{sub 1+x}Te{sub 1-y}Se{sub y}. United States: N. p., 2010. Web. doi:10.1016/j.jssc.2010.01.024.
Viennois, R, Giannini, E, Marel, D van der, & Cerny, R. Effect of Fe excess on structural, magnetic and superconducting properties of single-crystalline Fe{sub 1+x}Te{sub 1-y}Se{sub y}. United States. https://doi.org/10.1016/j.jssc.2010.01.024
Viennois, R, Giannini, E, Marel, D van der, and Cerny, R. Thu . "Effect of Fe excess on structural, magnetic and superconducting properties of single-crystalline Fe{sub 1+x}Te{sub 1-y}Se{sub y}". United States. https://doi.org/10.1016/j.jssc.2010.01.024.
@article{osti_21372551,
title = {Effect of Fe excess on structural, magnetic and superconducting properties of single-crystalline Fe{sub 1+x}Te{sub 1-y}Se{sub y}},
author = {Viennois, R and Giannini, E and Marel, D van der and Cerny, R},
abstractNote = {Single crystals of Fe{sub 1+x}Te{sub 1-y}Se{sub y} have been grown with a controlled Fe excess and Se doping, and the crystal structure has been refined for various compositions. The systematic investigation of magnetic and superconducting properties as a function of the structural parameters shows how the material can be driven into various ground states, depending on doping and the structural modifications. Our results prove that the occupation of the additional Fe site, Fe2, enhances the spin localization. By reducing the excess Fe, the antiferromagnetic ordering is weakened, and the superconducting ground state is favored. We have found that both Fe excess and Se doping in synergy determine the properties of the material and an improved 3-dimensional phase diagram is proposed. - Single crystals of Fe{sub 1+x}Te{sub 1-y}Se{sub y} have been grown with a controlled Fe off-stoichiometry and Se doping and the crystal structure has been refined for various compositions, thus proving the effect of both Fe excess and Se-substitutions on the structural properties. Either antiferromagnetic or superconducting ground state is driven by doping and related structural modifications. An improved 3-D phase diagram is proposed.},
doi = {10.1016/j.jssc.2010.01.024},
url = {https://www.osti.gov/biblio/21372551}, journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 4,
volume = 183,
place = {United States},
year = {2010},
month = {4}
}