Dispersion relation of Landau elementary excitations and thermodynamic properties of superfluid 4 He

Autores
Godfrin, H.; Beauvois, K.; Sultan, A.; Krotscheck, E.; Dawidowski, Javier; Fåk, B.; Ollivier, J.
Año de publicación
2021
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The dispersion relation ϵ(k) of the elementary excitations of superfluid He4 has been measured at very low temperatures, from saturated vapor pressure up to solidification, using a high-flux time-of-flight neutron-scattering spectrometer equipped with a high-spatial-resolution detector (105 "pixels"). A complete determination of ϵ(k) is achieved, from very low wave vectors up to the end of Pitaeskii's plateau. The results compare favorably in the whole the wave-vector range with the predictions of the dynamic many-body theory. At low wave vectors, bridging the gap between ultrasonic data and former neutron measurements, the evolution with the pressure from anomalous to normal dispersion, as well as the peculiar wave-vector dependence of the phase and group velocities, are accurately characterized. The thermodynamic properties have been calculated analytically, developing Landau's model, using the measured dispersion curve. A good agreement is found below 0.85 K between direct heat capacity measurements and the calculated specific heat, if thermodynamically consistent power series expansions are used. The thermodynamic properties have also been calculated numerically; in this case, the results are applicable with excellent accuracy up to 1.3 K, a temperature above which the dispersion relation itself becomes temperature dependent.
Fil: Godfrin, H.. Universite Grenoble Alpes; Francia
Fil: Beauvois, K.. Institut Laue Langevin; Francia
Fil: Sultan, A.. Institut Laue Langevin; Francia
Fil: Krotscheck, E.. Johannes Kepler University Linz; Austria
Fil: Dawidowski, Javier. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina
Fil: Fåk, B.. Institut Laue Langevin; Francia
Fil: Ollivier, J.. Institut Laue Langevin; Francia
Materia
Helio - 4
Superfluidez
Scattering inelástico de neutrones
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:11336/167504
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/167504
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Dispersion relation of Landau elementary excitations and thermodynamic properties of superfluid 4 HeGodfrin, H.Beauvois, K.Sultan, A.Krotscheck, E.Dawidowski, JavierFåk, B.Ollivier, J.Helio - 4SuperfluidezScattering inelástico de neutroneshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1The dispersion relation ϵ(k) of the elementary excitations of superfluid He4 has been measured at very low temperatures, from saturated vapor pressure up to solidification, using a high-flux time-of-flight neutron-scattering spectrometer equipped with a high-spatial-resolution detector (105 "pixels"). A complete determination of ϵ(k) is achieved, from very low wave vectors up to the end of Pitaeskii's plateau. The results compare favorably in the whole the wave-vector range with the predictions of the dynamic many-body theory. At low wave vectors, bridging the gap between ultrasonic data and former neutron measurements, the evolution with the pressure from anomalous to normal dispersion, as well as the peculiar wave-vector dependence of the phase and group velocities, are accurately characterized. The thermodynamic properties have been calculated analytically, developing Landau's model, using the measured dispersion curve. A good agreement is found below 0.85 K between direct heat capacity measurements and the calculated specific heat, if thermodynamically consistent power series expansions are used. The thermodynamic properties have also been calculated numerically; in this case, the results are applicable with excellent accuracy up to 1.3 K, a temperature above which the dispersion relation itself becomes temperature dependent.Fil: Godfrin, H.. Universite Grenoble Alpes; FranciaFil: Beauvois, K.. Institut Laue Langevin; FranciaFil: Sultan, A.. Institut Laue Langevin; FranciaFil: Krotscheck, E.. Johannes Kepler University Linz; AustriaFil: Dawidowski, Javier. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; ArgentinaFil: Fåk, B.. Institut Laue Langevin; FranciaFil: Ollivier, J.. Institut Laue Langevin; FranciaAmerican Physical Society2021-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/167504Godfrin, H.; Beauvois, K.; Sultan, A.; Krotscheck, E.; Dawidowski, Javier; et al.; Dispersion relation of Landau elementary excitations and thermodynamic properties of superfluid 4 He; American Physical Society; Physical Review B; 103; 10; 3-2021; 104516-1045492469-99502469-9969CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://journals.aps.org/prb/abstract/10.1103/PhysRevB.103.104516info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevB.103.104516info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:05:48Zoai:ri.conicet.gov.ar:11336/167504instacron: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:34982025-09-03 10:05:48.899CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Dispersion relation of Landau elementary excitations and thermodynamic properties of superfluid 4 He
title Dispersion relation of Landau elementary excitations and thermodynamic properties of superfluid 4 He
spellingShingle Dispersion relation of Landau elementary excitations and thermodynamic properties of superfluid 4 He
Godfrin, H.
Helio - 4
Superfluidez
Scattering inelástico de neutrones
title_short Dispersion relation of Landau elementary excitations and thermodynamic properties of superfluid 4 He
title_full Dispersion relation of Landau elementary excitations and thermodynamic properties of superfluid 4 He
title_fullStr Dispersion relation of Landau elementary excitations and thermodynamic properties of superfluid 4 He
title_full_unstemmed Dispersion relation of Landau elementary excitations and thermodynamic properties of superfluid 4 He
title_sort Dispersion relation of Landau elementary excitations and thermodynamic properties of superfluid 4 He
dc.creator.none.fl_str_mv Godfrin, H.
Beauvois, K.
Sultan, A.
Krotscheck, E.
Dawidowski, Javier
Fåk, B.
Ollivier, J.
author Godfrin, H.
author_facet Godfrin, H.
Beauvois, K.
Sultan, A.
Krotscheck, E.
Dawidowski, Javier
Fåk, B.
Ollivier, J.
author_role author
author2 Beauvois, K.
Sultan, A.
Krotscheck, E.
Dawidowski, Javier
Fåk, B.
Ollivier, J.
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Helio - 4
Superfluidez
Scattering inelástico de neutrones
topic Helio - 4
Superfluidez
Scattering inelástico de neutrones
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The dispersion relation ϵ(k) of the elementary excitations of superfluid He4 has been measured at very low temperatures, from saturated vapor pressure up to solidification, using a high-flux time-of-flight neutron-scattering spectrometer equipped with a high-spatial-resolution detector (105 "pixels"). A complete determination of ϵ(k) is achieved, from very low wave vectors up to the end of Pitaeskii's plateau. The results compare favorably in the whole the wave-vector range with the predictions of the dynamic many-body theory. At low wave vectors, bridging the gap between ultrasonic data and former neutron measurements, the evolution with the pressure from anomalous to normal dispersion, as well as the peculiar wave-vector dependence of the phase and group velocities, are accurately characterized. The thermodynamic properties have been calculated analytically, developing Landau's model, using the measured dispersion curve. A good agreement is found below 0.85 K between direct heat capacity measurements and the calculated specific heat, if thermodynamically consistent power series expansions are used. The thermodynamic properties have also been calculated numerically; in this case, the results are applicable with excellent accuracy up to 1.3 K, a temperature above which the dispersion relation itself becomes temperature dependent.
Fil: Godfrin, H.. Universite Grenoble Alpes; Francia
Fil: Beauvois, K.. Institut Laue Langevin; Francia
Fil: Sultan, A.. Institut Laue Langevin; Francia
Fil: Krotscheck, E.. Johannes Kepler University Linz; Austria
Fil: Dawidowski, Javier. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina
Fil: Fåk, B.. Institut Laue Langevin; Francia
Fil: Ollivier, J.. Institut Laue Langevin; Francia
description The dispersion relation ϵ(k) of the elementary excitations of superfluid He4 has been measured at very low temperatures, from saturated vapor pressure up to solidification, using a high-flux time-of-flight neutron-scattering spectrometer equipped with a high-spatial-resolution detector (105 "pixels"). A complete determination of ϵ(k) is achieved, from very low wave vectors up to the end of Pitaeskii's plateau. The results compare favorably in the whole the wave-vector range with the predictions of the dynamic many-body theory. At low wave vectors, bridging the gap between ultrasonic data and former neutron measurements, the evolution with the pressure from anomalous to normal dispersion, as well as the peculiar wave-vector dependence of the phase and group velocities, are accurately characterized. The thermodynamic properties have been calculated analytically, developing Landau's model, using the measured dispersion curve. A good agreement is found below 0.85 K between direct heat capacity measurements and the calculated specific heat, if thermodynamically consistent power series expansions are used. The thermodynamic properties have also been calculated numerically; in this case, the results are applicable with excellent accuracy up to 1.3 K, a temperature above which the dispersion relation itself becomes temperature dependent.
publishDate 2021
dc.date.none.fl_str_mv 2021-03
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/11336/167504
Godfrin, H.; Beauvois, K.; Sultan, A.; Krotscheck, E.; Dawidowski, Javier; et al.; Dispersion relation of Landau elementary excitations and thermodynamic properties of superfluid 4 He; American Physical Society; Physical Review B; 103; 10; 3-2021; 104516-104549
2469-9950
2469-9969
CONICET Digital
CONICET
url http://hdl.handle.net/11336/167504
identifier_str_mv Godfrin, H.; Beauvois, K.; Sultan, A.; Krotscheck, E.; Dawidowski, Javier; et al.; Dispersion relation of Landau elementary excitations and thermodynamic properties of superfluid 4 He; American Physical Society; Physical Review B; 103; 10; 3-2021; 104516-104549
2469-9950
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.103.104516
info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevB.103.104516
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
_version_ 1842269929499262976
score 13.13397

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