Unconventional superconductivity in the strong-coupling limit for the heavy fermion system CeCoIn5

Autores
Fasano, Yanina; Szabó, P.; Kačmarčík, J.; Pribulová, Z.; Pedrazzini, Pablo; Samuely, P.; Correa, Víctor Félix
Año de publicación
2018
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
We present scanning tunneling spectroscopy measurements of the local quasiparticles’ excitation spectra of the heavy fermion CeCoIn5 between 440 mK and 3 K in samples with a bulk Tc = 2.25 K. The spectral shape of our low-temperature tunneling data, quite textbook nodal-Δ conductance, allow us to confidently fit the spectra with a dwave density of states considering also a shortening of quasiparticles’ lifetime term Γ. The Δ(0) value obtained from the fits yields a BCS ratio 2Δ/kTc = 7.73 suggesting that CeCoIn5 is an unconventional superconductor in the strong coupling limit. The fits also reveal that the height of coherence peaks in CeCoIn5 is reduced with respect to a pure BCS spectra and therefore the coupling of quasiparticles with spin excitations should play a relevant role. The tunneling conductance shows a depletion at energies smaller than Δ for temperatures larger than the bulk Tc, giving further support to the existence of a pseudogap phase that in our samples span up to T∗ ∼ 1.2Tc. The phenomenological scaling of the pseudogap temperature observed in various families of cuprates, 2Δ/kT∗ ∼ 4.3, is not fulfilled in our measurements. This suggests that in CeCoIn5 the strong magnetic fluctuations might conspire to close the local superconducting gap at a smaller pesudogap temperature-scale than in cuprates.
Fil: Fasano, Yanina. Comisión Nacional de Energía Atómica. Gerencia del Area de Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Bariloche). División Bajas Temperaturas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Szabó, P.. Centre of Low Temperatures Physics; Eslovaquia
Fil: Kačmarčík, J.. Centre of Low Temperatures Physics; Eslovaquia
Fil: Pribulová, Z.. Centre of Low Temperatures Physics; Eslovaquia
Fil: Pedrazzini, Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Area de Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Bariloche). División Bajas Temperaturas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina
Fil: Samuely, P.. Centre of Low Temperatures Physics; Eslovaquia
Fil: Correa, Víctor Félix. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Area de Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Bariloche). División Bajas Temperaturas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina
International Conference on Strongly Correlated Electron Systems, SCES 2017
Prague
República Checa
SCES
Materia
Superconductivity
Soft condensed matter
Heavy fermions
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/141036
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/141036
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Unconventional superconductivity in the strong-coupling limit for the heavy fermion system CeCoIn5Fasano, YaninaSzabó, P.Kačmarčík, J.Pribulová, Z.Pedrazzini, PabloSamuely, P.Correa, Víctor FélixSuperconductivitySoft condensed matterHeavy fermionshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We present scanning tunneling spectroscopy measurements of the local quasiparticles’ excitation spectra of the heavy fermion CeCoIn5 between 440 mK and 3 K in samples with a bulk Tc = 2.25 K. The spectral shape of our low-temperature tunneling data, quite textbook nodal-Δ conductance, allow us to confidently fit the spectra with a dwave density of states considering also a shortening of quasiparticles’ lifetime term Γ. The Δ(0) value obtained from the fits yields a BCS ratio 2Δ/kTc = 7.73 suggesting that CeCoIn5 is an unconventional superconductor in the strong coupling limit. The fits also reveal that the height of coherence peaks in CeCoIn5 is reduced with respect to a pure BCS spectra and therefore the coupling of quasiparticles with spin excitations should play a relevant role. The tunneling conductance shows a depletion at energies smaller than Δ for temperatures larger than the bulk Tc, giving further support to the existence of a pseudogap phase that in our samples span up to T∗ ∼ 1.2Tc. The phenomenological scaling of the pseudogap temperature observed in various families of cuprates, 2Δ/kT∗ ∼ 4.3, is not fulfilled in our measurements. This suggests that in CeCoIn5 the strong magnetic fluctuations might conspire to close the local superconducting gap at a smaller pesudogap temperature-scale than in cuprates.Fil: Fasano, Yanina. Comisión Nacional de Energía Atómica. Gerencia del Area de Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Bariloche). División Bajas Temperaturas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Szabó, P.. Centre of Low Temperatures Physics; EslovaquiaFil: Kačmarčík, J.. Centre of Low Temperatures Physics; EslovaquiaFil: Pribulová, Z.. Centre of Low Temperatures Physics; EslovaquiaFil: Pedrazzini, Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Area de Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Bariloche). División Bajas Temperaturas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; ArgentinaFil: Samuely, P.. Centre of Low Temperatures Physics; EslovaquiaFil: Correa, Víctor Félix. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Area de Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Bariloche). División Bajas Temperaturas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; ArgentinaInternational Conference on Strongly Correlated Electron Systems, SCES 2017PragueRepública ChecaSCESElsevier2018info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectConferenciaJournalhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/141036Unconventional superconductivity in the strong-coupling limit for the heavy fermion system CeCoIn5; International Conference on Strongly Correlated Electron Systems, SCES 2017; Prague; República Checa; 2017; 798-8020921-4526CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0921452617307688info:eu-repo/semantics/altIdentifier/doi/10.1016/j.physb.2017.10.034Internacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-10T13:05:55Zoai:ri.conicet.gov.ar:11336/141036instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-10 13:05:55.376CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Unconventional superconductivity in the strong-coupling limit for the heavy fermion system CeCoIn5
title Unconventional superconductivity in the strong-coupling limit for the heavy fermion system CeCoIn5
spellingShingle Unconventional superconductivity in the strong-coupling limit for the heavy fermion system CeCoIn5
Fasano, Yanina
Superconductivity
Soft condensed matter
Heavy fermions
title_short Unconventional superconductivity in the strong-coupling limit for the heavy fermion system CeCoIn5
title_full Unconventional superconductivity in the strong-coupling limit for the heavy fermion system CeCoIn5
title_fullStr Unconventional superconductivity in the strong-coupling limit for the heavy fermion system CeCoIn5
title_full_unstemmed Unconventional superconductivity in the strong-coupling limit for the heavy fermion system CeCoIn5
title_sort Unconventional superconductivity in the strong-coupling limit for the heavy fermion system CeCoIn5
dc.creator.none.fl_str_mv Fasano, Yanina
Szabó, P.
Kačmarčík, J.
Pribulová, Z.
Pedrazzini, Pablo
Samuely, P.
Correa, Víctor Félix
author Fasano, Yanina
author_facet Fasano, Yanina
Szabó, P.
Kačmarčík, J.
Pribulová, Z.
Pedrazzini, Pablo
Samuely, P.
Correa, Víctor Félix
author_role author
author2 Szabó, P.
Kačmarčík, J.
Pribulová, Z.
Pedrazzini, Pablo
Samuely, P.
Correa, Víctor Félix
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Superconductivity
Soft condensed matter
Heavy fermions
topic Superconductivity
Soft condensed matter
Heavy fermions
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We present scanning tunneling spectroscopy measurements of the local quasiparticles’ excitation spectra of the heavy fermion CeCoIn5 between 440 mK and 3 K in samples with a bulk Tc = 2.25 K. The spectral shape of our low-temperature tunneling data, quite textbook nodal-Δ conductance, allow us to confidently fit the spectra with a dwave density of states considering also a shortening of quasiparticles’ lifetime term Γ. The Δ(0) value obtained from the fits yields a BCS ratio 2Δ/kTc = 7.73 suggesting that CeCoIn5 is an unconventional superconductor in the strong coupling limit. The fits also reveal that the height of coherence peaks in CeCoIn5 is reduced with respect to a pure BCS spectra and therefore the coupling of quasiparticles with spin excitations should play a relevant role. The tunneling conductance shows a depletion at energies smaller than Δ for temperatures larger than the bulk Tc, giving further support to the existence of a pseudogap phase that in our samples span up to T∗ ∼ 1.2Tc. The phenomenological scaling of the pseudogap temperature observed in various families of cuprates, 2Δ/kT∗ ∼ 4.3, is not fulfilled in our measurements. This suggests that in CeCoIn5 the strong magnetic fluctuations might conspire to close the local superconducting gap at a smaller pesudogap temperature-scale than in cuprates.
Fil: Fasano, Yanina. Comisión Nacional de Energía Atómica. Gerencia del Area de Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Bariloche). División Bajas Temperaturas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Szabó, P.. Centre of Low Temperatures Physics; Eslovaquia
Fil: Kačmarčík, J.. Centre of Low Temperatures Physics; Eslovaquia
Fil: Pribulová, Z.. Centre of Low Temperatures Physics; Eslovaquia
Fil: Pedrazzini, Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Area de Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Bariloche). División Bajas Temperaturas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina
Fil: Samuely, P.. Centre of Low Temperatures Physics; Eslovaquia
Fil: Correa, Víctor Félix. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Area de Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Bariloche). División Bajas Temperaturas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina
International Conference on Strongly Correlated Electron Systems, SCES 2017
Prague
República Checa
SCES
description We present scanning tunneling spectroscopy measurements of the local quasiparticles’ excitation spectra of the heavy fermion CeCoIn5 between 440 mK and 3 K in samples with a bulk Tc = 2.25 K. The spectral shape of our low-temperature tunneling data, quite textbook nodal-Δ conductance, allow us to confidently fit the spectra with a dwave density of states considering also a shortening of quasiparticles’ lifetime term Γ. The Δ(0) value obtained from the fits yields a BCS ratio 2Δ/kTc = 7.73 suggesting that CeCoIn5 is an unconventional superconductor in the strong coupling limit. The fits also reveal that the height of coherence peaks in CeCoIn5 is reduced with respect to a pure BCS spectra and therefore the coupling of quasiparticles with spin excitations should play a relevant role. The tunneling conductance shows a depletion at energies smaller than Δ for temperatures larger than the bulk Tc, giving further support to the existence of a pseudogap phase that in our samples span up to T∗ ∼ 1.2Tc. The phenomenological scaling of the pseudogap temperature observed in various families of cuprates, 2Δ/kT∗ ∼ 4.3, is not fulfilled in our measurements. This suggests that in CeCoIn5 the strong magnetic fluctuations might conspire to close the local superconducting gap at a smaller pesudogap temperature-scale than in cuprates.
publishDate 2018
dc.date.none.fl_str_mv 2018
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/conferenceObject
Conferencia
Journal
http://purl.org/coar/resource_type/c_5794
info:ar-repo/semantics/documentoDeConferencia
status_str publishedVersion
format conferenceObject
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/141036
Unconventional superconductivity in the strong-coupling limit for the heavy fermion system CeCoIn5; International Conference on Strongly Correlated Electron Systems, SCES 2017; Prague; República Checa; 2017; 798-802
0921-4526
CONICET Digital
CONICET
url http://hdl.handle.net/11336/141036
identifier_str_mv Unconventional superconductivity in the strong-coupling limit for the heavy fermion system CeCoIn5; International Conference on Strongly Correlated Electron Systems, SCES 2017; Prague; República Checa; 2017; 798-802
0921-4526
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0921452617307688
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.physb.2017.10.034
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.coverage.none.fl_str_mv Internacional
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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