Effect of External Pressure on the Metal–Insulator Transition of the Organic Quasi-Two-Dimensional Metal K-(BEDT-TTF)2Hg(SCN)2Br

The metal–insulator transition in the organic quasi-two-dimensional metal κ-(BEDT-TTF)2Hg(SCN)2Br at TMI ≈ 90 K has been investigated. The crystal structure changes during this transition from monoclinic above TMI to triclinic below TMI. A theoretical study suggested that this phase transition shoul...

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Autores: Pesotskii, Sergei I., Lyubovskii, Rustem B., Shilov, Gennady V., Zhilyaeva, Elena I., Canadell, Enric
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2022
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/282690
Acceso en línea:http://hdl.handle.net/10261/282690
Access Level:acceso abierto
Palabra clave:Organic conductors
Crystal structure
Phase transition
Band structures
Fermi surface
Conductivity
Magnetoresistance
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spelling Effect of External Pressure on the Metal–Insulator Transition of the Organic Quasi-Two-Dimensional Metal K-(BEDT-TTF)2Hg(SCN)2BrPesotskii, Sergei I.Lyubovskii, Rustem B.Shilov, Gennady V.Zhilyaeva, Elena I.Canadell, EnricOrganic conductorsCrystal structurePhase transitionBand structuresFermi surfaceConductivityPhase transitionMagnetoresistanceThe metal–insulator transition in the organic quasi-two-dimensional metal κ-(BEDT-TTF)2Hg(SCN)2Br at TMI ≈ 90 K has been investigated. The crystal structure changes during this transition from monoclinic above TMI to triclinic below TMI. A theoretical study suggested that this phase transition should be of the metal-to-metal type and brings about a substantial change of the Fermi surface. Apparently, the electronic system in the triclinic phase is unstable toward a Mott insulating state, leading to the growth of the resistance when the temperature drops below TMI ≈ 90 K. The application of external pressure suppresses the Mott transition and restores the metallic electronic structure of the triclinic phase. The observed quantum oscillations of the magnetoresistance are in good agreement with the calculated Fermi surface for the triclinic phase, providing a plausible explanation for the puzzling behavior of κ-(BEDT-TTF)2Hg(SCN)2Br as a function of temperature and pressure around 100 K. The present study points out interesting differences in the structural and physical behaviors of the two room temperature isostructural salts of κ-(BEDT-TTF)2Hg(SCN)2X with X = Br, Cl.The work at the Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry was carried out within the project of state assignment number AAAA-A19-119092390079-8. V.N.Z. acknowledges the support of the Russian Foundation for Basic Research No. 21-52-12027. The work in Spain was supported by the MICIU (Grant PGC2018-096955-B-C44) and Generalitat de Catalunya (2017SGR1506). E.C. acknowledges the support of the Spanish MICIU through the Severo Ochoa FUNFUTURE (CEX2019-000917-S) Excellence Center distinction.With funding from the Spanish government through the ‘Severo Ochoa Centre of Excellence’ accreditation (CEX2019-000917-S).Peer reviewedMolecular Diversity Preservation InternationalRussian Foundation for Basic ResearchMinisterio de Ciencia, Innovación y Universidades (España)Generalitat de CatalunyaConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202220222022info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/282690reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PGC2018-096955-B-C44info:eu-repo/grantAgreement/MICIU/Plan Estatal de investigación Científica y Técnica y de Innovación 2017-2020/CEX2019-000917-Shttp://dx.doi.org/10.3390/magnetochemistry8110152Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2826902026-05-22T06:33:51Z
dc.title.none.fl_str_mv Effect of External Pressure on the Metal–Insulator Transition of the Organic Quasi-Two-Dimensional Metal K-(BEDT-TTF)2Hg(SCN)2Br
title Effect of External Pressure on the Metal–Insulator Transition of the Organic Quasi-Two-Dimensional Metal K-(BEDT-TTF)2Hg(SCN)2Br
spellingShingle Effect of External Pressure on the Metal–Insulator Transition of the Organic Quasi-Two-Dimensional Metal K-(BEDT-TTF)2Hg(SCN)2Br
Pesotskii, Sergei I.
Organic conductors
Crystal structure
Phase transition
Band structures
Fermi surface
Conductivity
Phase transition
Magnetoresistance
title_short Effect of External Pressure on the Metal–Insulator Transition of the Organic Quasi-Two-Dimensional Metal K-(BEDT-TTF)2Hg(SCN)2Br
title_full Effect of External Pressure on the Metal–Insulator Transition of the Organic Quasi-Two-Dimensional Metal K-(BEDT-TTF)2Hg(SCN)2Br
title_fullStr Effect of External Pressure on the Metal–Insulator Transition of the Organic Quasi-Two-Dimensional Metal K-(BEDT-TTF)2Hg(SCN)2Br
title_full_unstemmed Effect of External Pressure on the Metal–Insulator Transition of the Organic Quasi-Two-Dimensional Metal K-(BEDT-TTF)2Hg(SCN)2Br
title_sort Effect of External Pressure on the Metal–Insulator Transition of the Organic Quasi-Two-Dimensional Metal K-(BEDT-TTF)2Hg(SCN)2Br
dc.creator.none.fl_str_mv Pesotskii, Sergei I.
Lyubovskii, Rustem B.
Shilov, Gennady V.
Zhilyaeva, Elena I.
Canadell, Enric
author Pesotskii, Sergei I.
author_facet Pesotskii, Sergei I.
Lyubovskii, Rustem B.
Shilov, Gennady V.
Zhilyaeva, Elena I.
Canadell, Enric
author_role author
author2 Lyubovskii, Rustem B.
Shilov, Gennady V.
Zhilyaeva, Elena I.
Canadell, Enric
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Russian Foundation for Basic Research
Ministerio de Ciencia, Innovación y Universidades (España)
Generalitat de Catalunya
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Organic conductors
Crystal structure
Phase transition
Band structures
Fermi surface
Conductivity
Phase transition
Magnetoresistance
topic Organic conductors
Crystal structure
Phase transition
Band structures
Fermi surface
Conductivity
Phase transition
Magnetoresistance
description The metal–insulator transition in the organic quasi-two-dimensional metal κ-(BEDT-TTF)2Hg(SCN)2Br at TMI ≈ 90 K has been investigated. The crystal structure changes during this transition from monoclinic above TMI to triclinic below TMI. A theoretical study suggested that this phase transition should be of the metal-to-metal type and brings about a substantial change of the Fermi surface. Apparently, the electronic system in the triclinic phase is unstable toward a Mott insulating state, leading to the growth of the resistance when the temperature drops below TMI ≈ 90 K. The application of external pressure suppresses the Mott transition and restores the metallic electronic structure of the triclinic phase. The observed quantum oscillations of the magnetoresistance are in good agreement with the calculated Fermi surface for the triclinic phase, providing a plausible explanation for the puzzling behavior of κ-(BEDT-TTF)2Hg(SCN)2Br as a function of temperature and pressure around 100 K. The present study points out interesting differences in the structural and physical behaviors of the two room temperature isostructural salts of κ-(BEDT-TTF)2Hg(SCN)2X with X = Br, Cl.
publishDate 2022
dc.date.none.fl_str_mv 2022
2022
2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/282690
url http://hdl.handle.net/10261/282690
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PGC2018-096955-B-C44
info:eu-repo/grantAgreement/MICIU/Plan Estatal de investigación Científica y Técnica y de Innovación 2017-2020/CEX2019-000917-S
http://dx.doi.org/10.3390/magnetochemistry8110152
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Molecular Diversity Preservation International
publisher.none.fl_str_mv Molecular Diversity Preservation International
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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