CeRuGe and CeRuSi: Heavy fermion systems with some unusual features

Autores
Sereni, Julian Gustavo Renzo; Caroca Canales, N.; Kumar, M.; Oeschler, N.; Gomez Berisso, Mariano; Geibel, C.
Año de publicación
2010
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We have investigated the physical properties of CeRuSi, its homologue CeRuGe and some doped La alloys. All of them present similar properties: large paramagnetic temperatures θP ≈ -100 K and the level off of χ(T) below ≈ 10 K in coincidence with the maximum decrease of ρ(T), which starts to drop below 25 K. The respective γ(CeRuSi) ' 0.18 and γ(CeRuGe) ' 0.15 J/molK2 coefficients reveal a heavy fermion character, with a Kondo temperature TK ≈ 50 K comparable to the crystal field splitting. In both compounds a broad maximum in CP (T)/T is observed around 5 K, whose origin is yet not clear. In contrast to the usual behavior observed in Kondo lattice systems, when Si is replaced by Ge TK ∝ θP and 1/γ practically does not decreases despite the unit cell volume of CeRuGe is about 3% larger than that of CeRuSi. We discuss possible origins for these unusual features.
Fil: Sereni, Julian Gustavo Renzo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica; Argentina
Fil: Caroca Canales, N.. Max Planck Institute for Chemical Physics of Solids; Alemania
Fil: Kumar, M.. Max Planck Institute for Chemical Physics of Solids; Alemania
Fil: Oeschler, N.. Max Planck Institute for Chemical Physics of Solids; Alemania
Fil: Gomez Berisso, Mariano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Bariloche); Argentina
Fil: Geibel, C.. Max Planck Institute for Chemical Physics of Solids; Alemania
Materia
Crystal-field splitting
Heavy fermion
Kondo lattice systems
Kondo temperatures
Unit-cell volume
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:11336/281624
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/281624
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling CeRuGe and CeRuSi: Heavy fermion systems with some unusual featuresSereni, Julian Gustavo RenzoCaroca Canales, N.Kumar, M.Oeschler, N.Gomez Berisso, MarianoGeibel, C.Crystal-field splittingHeavy fermionKondo lattice systemsKondo temperaturesUnit-cell volumehttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We have investigated the physical properties of CeRuSi, its homologue CeRuGe and some doped La alloys. All of them present similar properties: large paramagnetic temperatures θP ≈ -100 K and the level off of χ(T) below ≈ 10 K in coincidence with the maximum decrease of ρ(T), which starts to drop below 25 K. The respective γ(CeRuSi) ' 0.18 and γ(CeRuGe) ' 0.15 J/molK2 coefficients reveal a heavy fermion character, with a Kondo temperature TK ≈ 50 K comparable to the crystal field splitting. In both compounds a broad maximum in CP (T)/T is observed around 5 K, whose origin is yet not clear. In contrast to the usual behavior observed in Kondo lattice systems, when Si is replaced by Ge TK ∝ θP and 1/γ practically does not decreases despite the unit cell volume of CeRuGe is about 3% larger than that of CeRuSi. We discuss possible origins for these unusual features.Fil: Sereni, Julian Gustavo Renzo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica; ArgentinaFil: Caroca Canales, N.. Max Planck Institute for Chemical Physics of Solids; AlemaniaFil: Kumar, M.. Max Planck Institute for Chemical Physics of Solids; AlemaniaFil: Oeschler, N.. Max Planck Institute for Chemical Physics of Solids; AlemaniaFil: Gomez Berisso, Mariano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Bariloche); ArgentinaFil: Geibel, C.. Max Planck Institute for Chemical Physics of Solids; AlemaniaIOP Publishing2010-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/281624Sereni, Julian Gustavo Renzo; Caroca Canales, N.; Kumar, M.; Oeschler, N.; Gomez Berisso, Mariano; et al.; CeRuGe and CeRuSi: Heavy fermion systems with some unusual features; IOP Publishing; Journal of Physics: Conference Series; 200; 1; 7-2010; 1-81742-65881742-6596CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.1088/1742-6596/200/1/012181info:eu-repo/semantics/altIdentifier/doi/10.1088/1742-6596/200/1/012181info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2026-03-31T15:22:06Zoai:ri.conicet.gov.ar:11336/281624instacron: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:34982026-03-31 15:22:07.248CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv CeRuGe and CeRuSi: Heavy fermion systems with some unusual features
title CeRuGe and CeRuSi: Heavy fermion systems with some unusual features
spellingShingle CeRuGe and CeRuSi: Heavy fermion systems with some unusual features
Sereni, Julian Gustavo Renzo
Crystal-field splitting
Heavy fermion
Kondo lattice systems
Kondo temperatures
Unit-cell volume
title_short CeRuGe and CeRuSi: Heavy fermion systems with some unusual features
title_full CeRuGe and CeRuSi: Heavy fermion systems with some unusual features
title_fullStr CeRuGe and CeRuSi: Heavy fermion systems with some unusual features
title_full_unstemmed CeRuGe and CeRuSi: Heavy fermion systems with some unusual features
title_sort CeRuGe and CeRuSi: Heavy fermion systems with some unusual features
dc.creator.none.fl_str_mv Sereni, Julian Gustavo Renzo
Caroca Canales, N.
Kumar, M.
Oeschler, N.
Gomez Berisso, Mariano
Geibel, C.
author Sereni, Julian Gustavo Renzo
author_facet Sereni, Julian Gustavo Renzo
Caroca Canales, N.
Kumar, M.
Oeschler, N.
Gomez Berisso, Mariano
Geibel, C.
author_role author
author2 Caroca Canales, N.
Kumar, M.
Oeschler, N.
Gomez Berisso, Mariano
Geibel, C.
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Crystal-field splitting
Heavy fermion
Kondo lattice systems
Kondo temperatures
Unit-cell volume
topic Crystal-field splitting
Heavy fermion
Kondo lattice systems
Kondo temperatures
Unit-cell volume
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 have investigated the physical properties of CeRuSi, its homologue CeRuGe and some doped La alloys. All of them present similar properties: large paramagnetic temperatures θP ≈ -100 K and the level off of χ(T) below ≈ 10 K in coincidence with the maximum decrease of ρ(T), which starts to drop below 25 K. The respective γ(CeRuSi) ' 0.18 and γ(CeRuGe) ' 0.15 J/molK2 coefficients reveal a heavy fermion character, with a Kondo temperature TK ≈ 50 K comparable to the crystal field splitting. In both compounds a broad maximum in CP (T)/T is observed around 5 K, whose origin is yet not clear. In contrast to the usual behavior observed in Kondo lattice systems, when Si is replaced by Ge TK ∝ θP and 1/γ practically does not decreases despite the unit cell volume of CeRuGe is about 3% larger than that of CeRuSi. We discuss possible origins for these unusual features.
Fil: Sereni, Julian Gustavo Renzo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica; Argentina
Fil: Caroca Canales, N.. Max Planck Institute for Chemical Physics of Solids; Alemania
Fil: Kumar, M.. Max Planck Institute for Chemical Physics of Solids; Alemania
Fil: Oeschler, N.. Max Planck Institute for Chemical Physics of Solids; Alemania
Fil: Gomez Berisso, Mariano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Bariloche); Argentina
Fil: Geibel, C.. Max Planck Institute for Chemical Physics of Solids; Alemania
description We have investigated the physical properties of CeRuSi, its homologue CeRuGe and some doped La alloys. All of them present similar properties: large paramagnetic temperatures θP ≈ -100 K and the level off of χ(T) below ≈ 10 K in coincidence with the maximum decrease of ρ(T), which starts to drop below 25 K. The respective γ(CeRuSi) ' 0.18 and γ(CeRuGe) ' 0.15 J/molK2 coefficients reveal a heavy fermion character, with a Kondo temperature TK ≈ 50 K comparable to the crystal field splitting. In both compounds a broad maximum in CP (T)/T is observed around 5 K, whose origin is yet not clear. In contrast to the usual behavior observed in Kondo lattice systems, when Si is replaced by Ge TK ∝ θP and 1/γ practically does not decreases despite the unit cell volume of CeRuGe is about 3% larger than that of CeRuSi. We discuss possible origins for these unusual features.
publishDate 2010
dc.date.none.fl_str_mv 2010-07
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/11336/281624
Sereni, Julian Gustavo Renzo; Caroca Canales, N.; Kumar, M.; Oeschler, N.; Gomez Berisso, Mariano; et al.; CeRuGe and CeRuSi: Heavy fermion systems with some unusual features; IOP Publishing; Journal of Physics: Conference Series; 200; 1; 7-2010; 1-8
1742-6588
1742-6596
CONICET Digital
CONICET
url http://hdl.handle.net/11336/281624
identifier_str_mv Sereni, Julian Gustavo Renzo; Caroca Canales, N.; Kumar, M.; Oeschler, N.; Gomez Berisso, Mariano; et al.; CeRuGe and CeRuSi: Heavy fermion systems with some unusual features; IOP Publishing; Journal of Physics: Conference Series; 200; 1; 7-2010; 1-8
1742-6588
1742-6596
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://iopscience.iop.org/article/10.1088/1742-6596/200/1/012181
info:eu-repo/semantics/altIdentifier/doi/10.1088/1742-6596/200/1/012181
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 IOP Publishing
publisher.none.fl_str_mv IOP Publishing
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 12.822162

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