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dc.contributor.author
Beauvois, K.
dc.contributor.author
Dawidowski, Javier
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dc.contributor.author
Fåk, B.
dc.contributor.author
Godfrin, H.
dc.contributor.author
Krotscheck, E.
dc.contributor.author
Ollivier, J.
dc.contributor.author
Sultan, A.
dc.date.available
2020-08-24T17:31:48Z
dc.date.issued
2018-05
dc.identifier.citation
Beauvois, K.; Dawidowski, Javier; Fåk, B.; Godfrin, H.; Krotscheck, E.; et al.; Microscopic dynamics of superfluid 4He: A comprehensive study by inelastic neutron scattering; American Physical Society; Physical Review B; 97; 18; 5-2018; 1-18; 184520
dc.identifier.issn
2469-9969
dc.identifier.uri
http://hdl.handle.net/11336/112265
dc.description.abstract
The dynamic structure factor of superfluid 4 He has been investigated at very low temperatures by inelastic neutron scattering. The measurements combine different incoming energies resulting in an unprecedentedly large dynamic range with excellent energy resolution, covering wave vectors Q up to 5 Å^(-1) and energies ω up to 15 meV. A detailed description of the dynamics of superfluid 4He is obtained from saturated vapor pressure up to solidification. The single-excitation spectrum is substantially modified at high pressures, as the maxon energy exceeds the roton-roton decay threshold. A highly structured multiexcitation spectrum is observed at lowenergies, where clear thresholds and branches have been identified. Strong phonon emission branches are observed when the phonon or roton group velocities exceed the sound velocity. The spectrum is found to display strong multiexcitations whenever the single excitations face disintegration following Pitaevskii's type a or b criteria. At intermediate energies, an interesting pattern in the dynamic structure factor is observed in the vicinity of the recoil energy. All these features, which evolve significantly with pressure, are in very good agreement with the dynamic many-body calculations, even at the highest densities, where the correlations are strongest.
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/2.5/ar/
dc.subject
HELIO 4
dc.subject
SUPREFLUIDOS
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DINÁMICA Y ESTRUCTURA DE LÍQUIDOS
dc.subject.classification
Física Atómica, Molecular y Química
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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
Microscopic dynamics of superfluid 4He: A comprehensive study by inelastic neutron scattering
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-10-15T17:57:39Z
dc.journal.volume
97
dc.journal.number
18
dc.journal.pagination
1-18; 184520
dc.journal.pais
Estados Unidos
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dc.journal.ciudad
Nueva York
dc.description.fil
Fil: Beauvois, K.. Universite Grenoble Alpes. Institut Nanosciences et Cryogenie - Commissariat a L´Energie Atomique et Aux Energies Alternatives. Institut Nanosciences et Cryogenie; Francia. Institut Laue Langevin; Francia
dc.description.fil
Fil: Dawidowski, Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina
dc.description.fil
Fil: Fåk, B.. Institut Laue Langevin; Francia
dc.description.fil
Fil: Godfrin, H.. Universite Grenoble Alpes. Institut Nanosciences et Cryogenie - Commissariat a L´Energie Atomique et Aux Energies Alternatives. Institut Nanosciences et Cryogenie; Francia
dc.description.fil
Fil: Krotscheck, E.. State University of New York; Estados Unidos
dc.description.fil
Fil: Ollivier, J.. Institut Laue Langevin; Francia
dc.description.fil
Fil: Sultan, A.. Universite Grenoble Alpes. Institut Nanosciences et Cryogenie - Commissariat a L´Energie Atomique et Aux Energies Alternatives. Institut Nanosciences et Cryogenie; 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.97.184520
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1103/PhysRevB.97.184520
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1802.08120
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