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dc.contributor.author
Godfrin, H.
dc.contributor.author
Beauvois, K.
dc.contributor.author
Sultan, A.
dc.contributor.author
Krotscheck, E.
dc.contributor.author
Dawidowski, Javier
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dc.contributor.author
Fåk, B.
dc.contributor.author
Ollivier, J.
dc.date.available
2022-09-06T12:20:22Z
dc.date.issued
2021-03
dc.identifier.citation
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
dc.identifier.issn
2469-9950
dc.identifier.uri
http://hdl.handle.net/11336/167504
dc.description.abstract
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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Physical Society
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Helio - 4
dc.subject
Superfluidez
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Scattering inelástico de neutrones
dc.subject.classification
Física de los Materiales Condensados
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Dispersion relation of Landau elementary excitations and thermodynamic properties of superfluid 4 He
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2022-08-30T20:00:35Z
dc.identifier.eissn
2469-9969
dc.journal.volume
103
dc.journal.number
10
dc.journal.pagination
104516-104549
dc.journal.pais
Estados Unidos
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dc.description.fil
Fil: Godfrin, H.. Universite Grenoble Alpes; Francia
dc.description.fil
Fil: Beauvois, K.. Institut Laue Langevin; Francia
dc.description.fil
Fil: Sultan, A.. Institut Laue Langevin; Francia
dc.description.fil
Fil: Krotscheck, E.. Johannes Kepler University Linz; Austria
dc.description.fil
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
dc.description.fil
Fil: Fåk, B.. Institut Laue Langevin; Francia
dc.description.fil
Fil: Ollivier, J.. Institut Laue Langevin; Francia
dc.journal.title
Physical Review B
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://journals.aps.org/prb/abstract/10.1103/PhysRevB.103.104516
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1103/PhysRevB.103.104516
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