Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/101741
Title: Majority carrier type inversion in the FeSe family and a 'doped semimetal' scheme in iron-based superconductors
Authors: Ovchenkov, Y. A.
Chareev, D. A.
Kulbachinskii, V. A.
Kytin, V. G.
Mishkov, S. V.
Presnov, D. E.
Volkova, O. S.
Vasiliev, A. N.
Issue Date: 2019
Publisher: Institute of Physics Publishing
Citation: Majority carrier type inversion in the FeSe family and a 'doped semimetal' scheme in iron-based superconductors / Y. A. Ovchenkov, D. A. Chareev, V. A. Kulbachinskii, et al. — DOI 10.1088/1361-6668/ab1387 // Superconductor Science and Technology. — 2019. — Vol. 32. — Iss. 6. — 065005.
Abstract: The field and temperature dependencies of the longitudinal and Hall components of resistivity have been studied for high-quality FeSe1-xSx (x up to 0.14) single crystals. A quasiclassical analysis of the experimental data indicates a strong variation of electron and hole concentrations under the studied isovalent substitution and a clear trend towards the majority carrier type inversion. On this basis, we propose a 'doped semimetal' scheme for the superconducting phase diagram of the FeSe family, which can probably be applied to other iron-based superconductors. In this scheme, the two local maxima of the superconducting temperature can be associated with the Van Hove singularities of a simplified semi-metallic electronic structure. A multicarrier analysis of the experimental data also reveals the presence of a tiny and highly mobile electron band for all the samples studied. Substitution for sulfur in the studied range leads to one order decreasing in the density of highly mobile electrons, from 3% to 0.2% of the total carrier concentration. The mobility of these carriers does not depend on impurities, which may indicate an enhanced electron-phonon interaction and allows us to consider the highly mobile carriers as a possible source of unusual acoustic properties of FeSe. © 2019 IOP Publishing Ltd.
Keywords: FESE
MAGNETOTRANSPORT PROPERTIES
VAN HOVE SINGULARITY
ACOUSTIC PROPERTIES
CARRIER CONCENTRATION
CRYSTAL IMPURITIES
ELECTRON-PHONON INTERACTIONS
ELECTRONIC STRUCTURE
ELECTRONS
IRON COMPOUNDS
SELENIUM COMPOUNDS
SINGLE CRYSTALS
FESE
HIGHLY MOBILE ELECTRONS
ISOVALENT SUBSTITUTION
MAGNETO TRANSPORT PROPERTIES
SUPERCONDUCTING PHASE DIAGRAMS
SUPERCONDUCTING TEMPERATURES
TEMPERATURE DEPENDENCIES
VAN HOVE SINGULARITIES
IRON-BASED SUPERCONDUCTORS
URI: http://hdl.handle.net/10995/101741
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85067790254
PURE ID: 9827714
ISSN: 9532048
DOI: 10.1088/1361-6668/ab1387
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

Files in This Item:
File Description SizeFormat 
2-s2.0-85067790254.pdf2,28 MBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.