Collapse of the G d 3 + ESR fine structure throughout the coherent temperature of the Gd-doped Kondo Semiconductor CeF e 4 P 12

Autores
Venegas, P. A.; Garcia, F. A.; Garcia, Daniel Julio; Cabrera, G. G.; Avila, M. A.; Rettori, C.
Año de publicación
2016
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Recent experiments on Gd3+ electron-spin resonance (ESR) in the filled skutterudite Ce1−xGdxFe4P12(x≈0.001), at temperatures where the host resistivity manifests a smooth insulator-metal crossover, provide evidence of the underlying Kondo physics associated with this system. At low temperatures (below T≈160 K), Ce1−xGdxFe4P12 behaves as a Kondo insulator with a relatively large hybridization gap, and the Gd3+ ESR spectra display a fine structure with Lorentzian line shape, typical of insulating media. In this work, based on previous experiments performed by the same group, we argue that the electronic gap may be attributed to the large hybridization present in the coherent regime of a Kondo lattice. Moreover, mean-field calculations suggest that the electron-phonon interaction is fundamental at explaining such hybridization. The resulting electronic structure is strongly temperature dependent, and at T∗≈160K the system undergoes an insulator-to-metal transition induced by the withdrawal of 4f electrons from the Fermi volume, the system becoming metallic and nonmagnetic. The Gd3+ ESR fine structure coalesces into a single Dysonian resonance, as in metals. Our simulations suggest that exchange narrowing via the usual Korringa mechanism is not enough to describe the thermal behavior of the Gd3+ ESR spectra in the entire temperature region (4.2–300 K). We propose that the temperature activated fluctuating valence of the Ce ions is the key ingredient that fully describes this unique temperature dependence of the Gd3+ ESR fine structure
Fil: Venegas, P. A.. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil
Fil: Garcia, F. A.. Universidade de Sao Paulo; Brasil
Fil: Garcia, Daniel Julio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina
Fil: Cabrera, G. G.. Universidad Estatal de Campinas; Brasil
Fil: Avila, M. A.. Universidade Federal Do Abc; Brasil
Fil: Rettori, C.. Universidad Estatal de Campinas; Brasil. Universidade Federal Do Abc; Brasil
Materia
Kondo Semiconductor
Esr
Insulator-Metal Crossover
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:11336/66180
Acceder
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network_acronym_str CONICETDig
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network_name_str CONICET Digital (CONICET)
spelling Collapse of the G d 3 + ESR fine structure throughout the coherent temperature of the Gd-doped Kondo Semiconductor CeF e 4 P 12Venegas, P. A.Garcia, F. A.Garcia, Daniel JulioCabrera, G. G.Avila, M. A.Rettori, C.Kondo SemiconductorEsrInsulator-Metal Crossoverhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Recent experiments on Gd3+ electron-spin resonance (ESR) in the filled skutterudite Ce1−xGdxFe4P12(x≈0.001), at temperatures where the host resistivity manifests a smooth insulator-metal crossover, provide evidence of the underlying Kondo physics associated with this system. At low temperatures (below T≈160 K), Ce1−xGdxFe4P12 behaves as a Kondo insulator with a relatively large hybridization gap, and the Gd3+ ESR spectra display a fine structure with Lorentzian line shape, typical of insulating media. In this work, based on previous experiments performed by the same group, we argue that the electronic gap may be attributed to the large hybridization present in the coherent regime of a Kondo lattice. Moreover, mean-field calculations suggest that the electron-phonon interaction is fundamental at explaining such hybridization. The resulting electronic structure is strongly temperature dependent, and at T∗≈160K the system undergoes an insulator-to-metal transition induced by the withdrawal of 4f electrons from the Fermi volume, the system becoming metallic and nonmagnetic. The Gd3+ ESR fine structure coalesces into a single Dysonian resonance, as in metals. Our simulations suggest that exchange narrowing via the usual Korringa mechanism is not enough to describe the thermal behavior of the Gd3+ ESR spectra in the entire temperature region (4.2–300 K). We propose that the temperature activated fluctuating valence of the Ce ions is the key ingredient that fully describes this unique temperature dependence of the Gd3+ ESR fine structureFil: Venegas, P. A.. Universidade Estadual Paulista Julio de Mesquita Filho; BrasilFil: Garcia, F. A.. Universidade de Sao Paulo; BrasilFil: Garcia, Daniel Julio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; ArgentinaFil: Cabrera, G. G.. Universidad Estatal de Campinas; BrasilFil: Avila, M. A.. Universidade Federal Do Abc; BrasilFil: Rettori, C.. Universidad Estatal de Campinas; Brasil. Universidade Federal Do Abc; BrasilAmerican Physical Society2016-12-15info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/66180Venegas, P. A.; Garcia, F. A.; Garcia, Daniel Julio; Cabrera, G. G.; Avila, M. A.; et al.; Collapse of the G d 3 + ESR fine structure throughout the coherent temperature of the Gd-doped Kondo Semiconductor CeF e 4 P 12; American Physical Society; Physical Review B; 94; 23; 15-12-2016; 235143/1-82469-9969CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://journals.aps.org/prb/abstract/10.1103/PhysRevB.94.235143info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevB.94.235143info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2026-06-04T11:12:41Zoai:ri.conicet.gov.ar:11336/66180instacron: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:34982026-06-04 11:12:41.423CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Collapse of the G d 3 + ESR fine structure throughout the coherent temperature of the Gd-doped Kondo Semiconductor CeF e 4 P 12
title Collapse of the G d 3 + ESR fine structure throughout the coherent temperature of the Gd-doped Kondo Semiconductor CeF e 4 P 12
spellingShingle Collapse of the G d 3 + ESR fine structure throughout the coherent temperature of the Gd-doped Kondo Semiconductor CeF e 4 P 12
Venegas, P. A.
Kondo Semiconductor
Esr
Insulator-Metal Crossover
title_short Collapse of the G d 3 + ESR fine structure throughout the coherent temperature of the Gd-doped Kondo Semiconductor CeF e 4 P 12
title_full Collapse of the G d 3 + ESR fine structure throughout the coherent temperature of the Gd-doped Kondo Semiconductor CeF e 4 P 12
title_fullStr Collapse of the G d 3 + ESR fine structure throughout the coherent temperature of the Gd-doped Kondo Semiconductor CeF e 4 P 12
title_full_unstemmed Collapse of the G d 3 + ESR fine structure throughout the coherent temperature of the Gd-doped Kondo Semiconductor CeF e 4 P 12
title_sort Collapse of the G d 3 + ESR fine structure throughout the coherent temperature of the Gd-doped Kondo Semiconductor CeF e 4 P 12
dc.creator.none.fl_str_mv Venegas, P. A.
Garcia, F. A.
Garcia, Daniel Julio
Cabrera, G. G.
Avila, M. A.
Rettori, C.
author Venegas, P. A.
author_facet Venegas, P. A.
Garcia, F. A.
Garcia, Daniel Julio
Cabrera, G. G.
Avila, M. A.
Rettori, C.
author_role author
author2 Garcia, F. A.
Garcia, Daniel Julio
Cabrera, G. G.
Avila, M. A.
Rettori, C.
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Kondo Semiconductor
Esr
Insulator-Metal Crossover
topic Kondo Semiconductor
Esr
Insulator-Metal Crossover
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Recent experiments on Gd3+ electron-spin resonance (ESR) in the filled skutterudite Ce1−xGdxFe4P12(x≈0.001), at temperatures where the host resistivity manifests a smooth insulator-metal crossover, provide evidence of the underlying Kondo physics associated with this system. At low temperatures (below T≈160 K), Ce1−xGdxFe4P12 behaves as a Kondo insulator with a relatively large hybridization gap, and the Gd3+ ESR spectra display a fine structure with Lorentzian line shape, typical of insulating media. In this work, based on previous experiments performed by the same group, we argue that the electronic gap may be attributed to the large hybridization present in the coherent regime of a Kondo lattice. Moreover, mean-field calculations suggest that the electron-phonon interaction is fundamental at explaining such hybridization. The resulting electronic structure is strongly temperature dependent, and at T∗≈160K the system undergoes an insulator-to-metal transition induced by the withdrawal of 4f electrons from the Fermi volume, the system becoming metallic and nonmagnetic. The Gd3+ ESR fine structure coalesces into a single Dysonian resonance, as in metals. Our simulations suggest that exchange narrowing via the usual Korringa mechanism is not enough to describe the thermal behavior of the Gd3+ ESR spectra in the entire temperature region (4.2–300 K). We propose that the temperature activated fluctuating valence of the Ce ions is the key ingredient that fully describes this unique temperature dependence of the Gd3+ ESR fine structure
Fil: Venegas, P. A.. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil
Fil: Garcia, F. A.. Universidade de Sao Paulo; Brasil
Fil: Garcia, Daniel Julio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina
Fil: Cabrera, G. G.. Universidad Estatal de Campinas; Brasil
Fil: Avila, M. A.. Universidade Federal Do Abc; Brasil
Fil: Rettori, C.. Universidad Estatal de Campinas; Brasil. Universidade Federal Do Abc; Brasil
description Recent experiments on Gd3+ electron-spin resonance (ESR) in the filled skutterudite Ce1−xGdxFe4P12(x≈0.001), at temperatures where the host resistivity manifests a smooth insulator-metal crossover, provide evidence of the underlying Kondo physics associated with this system. At low temperatures (below T≈160 K), Ce1−xGdxFe4P12 behaves as a Kondo insulator with a relatively large hybridization gap, and the Gd3+ ESR spectra display a fine structure with Lorentzian line shape, typical of insulating media. In this work, based on previous experiments performed by the same group, we argue that the electronic gap may be attributed to the large hybridization present in the coherent regime of a Kondo lattice. Moreover, mean-field calculations suggest that the electron-phonon interaction is fundamental at explaining such hybridization. The resulting electronic structure is strongly temperature dependent, and at T∗≈160K the system undergoes an insulator-to-metal transition induced by the withdrawal of 4f electrons from the Fermi volume, the system becoming metallic and nonmagnetic. The Gd3+ ESR fine structure coalesces into a single Dysonian resonance, as in metals. Our simulations suggest that exchange narrowing via the usual Korringa mechanism is not enough to describe the thermal behavior of the Gd3+ ESR spectra in the entire temperature region (4.2–300 K). We propose that the temperature activated fluctuating valence of the Ce ions is the key ingredient that fully describes this unique temperature dependence of the Gd3+ ESR fine structure
publishDate 2016
dc.date.none.fl_str_mv 2016-12-15
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/66180
Venegas, P. A.; Garcia, F. A.; Garcia, Daniel Julio; Cabrera, G. G.; Avila, M. A.; et al.; Collapse of the G d 3 + ESR fine structure throughout the coherent temperature of the Gd-doped Kondo Semiconductor CeF e 4 P 12; American Physical Society; Physical Review B; 94; 23; 15-12-2016; 235143/1-8
2469-9969
CONICET Digital
CONICET
url http://hdl.handle.net/11336/66180
identifier_str_mv Venegas, P. A.; Garcia, F. A.; Garcia, Daniel Julio; Cabrera, G. G.; Avila, M. A.; et al.; Collapse of the G d 3 + ESR fine structure throughout the coherent temperature of the Gd-doped Kondo Semiconductor CeF e 4 P 12; American Physical Society; Physical Review B; 94; 23; 15-12-2016; 235143/1-8
2469-9969
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://journals.aps.org/prb/abstract/10.1103/PhysRevB.94.235143
info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevB.94.235143
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.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
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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score 12.832306

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