Entropy Bottlenecks at T →0 in Ce-Lattice and Related Compounds

Autores
Sereni, Julian Gustavo Renzo
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
A number of specific heat (Formula presented.) anomalies are reported in Ce- and Yb-lattice compounds around 1 K which cannot be associated to usual phase transitions despite of their robust magnetic moments. Instead of a (Formula presented.) jump, these anomalies show coincident morphology: (i) a significant tail in (Formula presented.), with similar power law decay above their maxima ((Formula presented.)), (ii) whereas a (Formula presented.) dependence is observed below (Formula presented.). (iii) The comparison of their respective entropy gain (Formula presented.) indicates that (Formula presented.)ln2 is condensed within the (Formula presented.) tail, in coincidence with an exemplary spin-ice compound. Such amount of entropy arises from a significant increase of the density of low energy excitations, reflected in a divergent (Formula presented.) dependence. (iv) Many of their lattice structures present conditions for magnetic frustration. The origin of these anomalies can be attributed to an interplay between the divergent density of magnetic excitations at (Formula presented.) and the limited amount of degrees of freedom: (Formula presented.)ln2 for a doublet-ground state. Due to this “entropy bottleneck,” the paramagnetic minimum of energy blurs out and the system slides into an alternative minimum through a continuous transition. A relevant observation in these very heavy fermion systems is the possible existence of an upper limit for (Formula presented.)J/mol K(Formula presented.) observed in four Yb- and Pr-based compounds.
Fil: Sereni, Julian Gustavo Renzo. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Materia
Entropy
Heavy Fermions
Specific Heat Anomalies
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:11336/37340
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/37340
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Entropy Bottlenecks at T →0 in Ce-Lattice and Related CompoundsSereni, Julian Gustavo RenzoEntropyHeavy FermionsSpecific Heat Anomalieshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1A number of specific heat (Formula presented.) anomalies are reported in Ce- and Yb-lattice compounds around 1 K which cannot be associated to usual phase transitions despite of their robust magnetic moments. Instead of a (Formula presented.) jump, these anomalies show coincident morphology: (i) a significant tail in (Formula presented.), with similar power law decay above their maxima ((Formula presented.)), (ii) whereas a (Formula presented.) dependence is observed below (Formula presented.). (iii) The comparison of their respective entropy gain (Formula presented.) indicates that (Formula presented.)ln2 is condensed within the (Formula presented.) tail, in coincidence with an exemplary spin-ice compound. Such amount of entropy arises from a significant increase of the density of low energy excitations, reflected in a divergent (Formula presented.) dependence. (iv) Many of their lattice structures present conditions for magnetic frustration. The origin of these anomalies can be attributed to an interplay between the divergent density of magnetic excitations at (Formula presented.) and the limited amount of degrees of freedom: (Formula presented.)ln2 for a doublet-ground state. Due to this “entropy bottleneck,” the paramagnetic minimum of energy blurs out and the system slides into an alternative minimum through a continuous transition. A relevant observation in these very heavy fermion systems is the possible existence of an upper limit for (Formula presented.)J/mol K(Formula presented.) observed in four Yb- and Pr-based compounds.Fil: Sereni, Julian Gustavo Renzo. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaSpringer/Plenum Publishers2015-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/37340Sereni, Julian Gustavo Renzo; Entropy Bottlenecks at T →0 in Ce-Lattice and Related Compounds; Springer/Plenum Publishers; Journal of Low Temperature Physics; 179; 1-2; 1-2015; 126-1370022-22911573-7357CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1007/s10909-014-1228-zinfo:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007/s10909-014-1228-zinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-10T13:15:47Zoai:ri.conicet.gov.ar:11336/37340instacron: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 13:15:47.939CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Entropy Bottlenecks at T →0 in Ce-Lattice and Related Compounds
title Entropy Bottlenecks at T →0 in Ce-Lattice and Related Compounds
spellingShingle Entropy Bottlenecks at T →0 in Ce-Lattice and Related Compounds
Sereni, Julian Gustavo Renzo
Entropy
Heavy Fermions
Specific Heat Anomalies
title_short Entropy Bottlenecks at T →0 in Ce-Lattice and Related Compounds
title_full Entropy Bottlenecks at T →0 in Ce-Lattice and Related Compounds
title_fullStr Entropy Bottlenecks at T →0 in Ce-Lattice and Related Compounds
title_full_unstemmed Entropy Bottlenecks at T →0 in Ce-Lattice and Related Compounds
title_sort Entropy Bottlenecks at T →0 in Ce-Lattice and Related Compounds
dc.creator.none.fl_str_mv Sereni, Julian Gustavo Renzo
author Sereni, Julian Gustavo Renzo
author_facet Sereni, Julian Gustavo Renzo
author_role author
dc.subject.none.fl_str_mv Entropy
Heavy Fermions
Specific Heat Anomalies
topic Entropy
Heavy Fermions
Specific Heat Anomalies
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv A number of specific heat (Formula presented.) anomalies are reported in Ce- and Yb-lattice compounds around 1 K which cannot be associated to usual phase transitions despite of their robust magnetic moments. Instead of a (Formula presented.) jump, these anomalies show coincident morphology: (i) a significant tail in (Formula presented.), with similar power law decay above their maxima ((Formula presented.)), (ii) whereas a (Formula presented.) dependence is observed below (Formula presented.). (iii) The comparison of their respective entropy gain (Formula presented.) indicates that (Formula presented.)ln2 is condensed within the (Formula presented.) tail, in coincidence with an exemplary spin-ice compound. Such amount of entropy arises from a significant increase of the density of low energy excitations, reflected in a divergent (Formula presented.) dependence. (iv) Many of their lattice structures present conditions for magnetic frustration. The origin of these anomalies can be attributed to an interplay between the divergent density of magnetic excitations at (Formula presented.) and the limited amount of degrees of freedom: (Formula presented.)ln2 for a doublet-ground state. Due to this “entropy bottleneck,” the paramagnetic minimum of energy blurs out and the system slides into an alternative minimum through a continuous transition. A relevant observation in these very heavy fermion systems is the possible existence of an upper limit for (Formula presented.)J/mol K(Formula presented.) observed in four Yb- and Pr-based compounds.
Fil: Sereni, Julian Gustavo Renzo. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
description A number of specific heat (Formula presented.) anomalies are reported in Ce- and Yb-lattice compounds around 1 K which cannot be associated to usual phase transitions despite of their robust magnetic moments. Instead of a (Formula presented.) jump, these anomalies show coincident morphology: (i) a significant tail in (Formula presented.), with similar power law decay above their maxima ((Formula presented.)), (ii) whereas a (Formula presented.) dependence is observed below (Formula presented.). (iii) The comparison of their respective entropy gain (Formula presented.) indicates that (Formula presented.)ln2 is condensed within the (Formula presented.) tail, in coincidence with an exemplary spin-ice compound. Such amount of entropy arises from a significant increase of the density of low energy excitations, reflected in a divergent (Formula presented.) dependence. (iv) Many of their lattice structures present conditions for magnetic frustration. The origin of these anomalies can be attributed to an interplay between the divergent density of magnetic excitations at (Formula presented.) and the limited amount of degrees of freedom: (Formula presented.)ln2 for a doublet-ground state. Due to this “entropy bottleneck,” the paramagnetic minimum of energy blurs out and the system slides into an alternative minimum through a continuous transition. A relevant observation in these very heavy fermion systems is the possible existence of an upper limit for (Formula presented.)J/mol K(Formula presented.) observed in four Yb- and Pr-based compounds.
publishDate 2015
dc.date.none.fl_str_mv 2015-01
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/11336/37340
Sereni, Julian Gustavo Renzo; Entropy Bottlenecks at T →0 in Ce-Lattice and Related Compounds; Springer/Plenum Publishers; Journal of Low Temperature Physics; 179; 1-2; 1-2015; 126-137
0022-2291
1573-7357
CONICET Digital
CONICET
url http://hdl.handle.net/11336/37340
identifier_str_mv Sereni, Julian Gustavo Renzo; Entropy Bottlenecks at T →0 in Ce-Lattice and Related Compounds; Springer/Plenum Publishers; Journal of Low Temperature Physics; 179; 1-2; 1-2015; 126-137
0022-2291
1573-7357
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1007/s10909-014-1228-z
info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007/s10909-014-1228-z
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
application/pdf
dc.publisher.none.fl_str_mv Springer/Plenum Publishers
publisher.none.fl_str_mv Springer/Plenum Publishers
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 12.993085

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