Magnons and excitation continuum in XXZ triangular antiferromagnetic model: Application to Ba3CoSb2O9
- Autores
- Ghioldi, Esteban Agustín; Mezio, Alejandro; Manuel, Luis Oscar; Singh, R. R. P.; Oitmaa, J.; Trumper, Adolfo Emilio
- Año de publicación
- 2015
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- We investigate the excitation spectrum of the triangular-lattice antiferromagnetic XXZ model using series expansion and mean field Schwinger boson approaches. The single-magnon spectrum computed with series expansion exhibits rotonic minima at the middle points of the edges of the Brillouin zone, for all values of the anisotropy parameter in the range 0≤Jz/J≤1. Based on the good agreement with series expansion for the single-magnon spectrum, we compute the full dynamical magnetic structure factor within the mean field Schwinger boson approach to investigate the relevance of the XXZ model for the description of the unusual spectrum found recently in Ba3CoSb2O9. In particular, we obtain an extended continuum above the spin wave excitations, which is further enhanced and brought closer to those observed in Ba3CoSb2O9 with the addition of a second neighbor exchange interaction approximately 15% of the nearest-neighbor value. Our results support the idea that excitation continuum with substantial spectral-weight are generically present in two-dimensional frustrated spin systems and fractionalization in terms of bosonic spinons presents an efficient way to describe them.
Fil: Ghioldi, Esteban Agustín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentina
Fil: Mezio, Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentina
Fil: Manuel, Luis Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentina
Fil: Singh, R. R. P.. University of California; Estados Unidos
Fil: Oitmaa, J.. University of New South Wales; Australia
Fil: Trumper, Adolfo Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentina - Materia
-
Strong Correlation
Magnetic Frustration
Heisenberg Model
Magnons - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/51075
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Magnons and excitation continuum in XXZ triangular antiferromagnetic model: Application to Ba3CoSb2O9Ghioldi, Esteban AgustínMezio, AlejandroManuel, Luis OscarSingh, R. R. P.Oitmaa, J.Trumper, Adolfo EmilioStrong CorrelationMagnetic FrustrationHeisenberg ModelMagnonshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We investigate the excitation spectrum of the triangular-lattice antiferromagnetic XXZ model using series expansion and mean field Schwinger boson approaches. The single-magnon spectrum computed with series expansion exhibits rotonic minima at the middle points of the edges of the Brillouin zone, for all values of the anisotropy parameter in the range 0≤Jz/J≤1. Based on the good agreement with series expansion for the single-magnon spectrum, we compute the full dynamical magnetic structure factor within the mean field Schwinger boson approach to investigate the relevance of the XXZ model for the description of the unusual spectrum found recently in Ba3CoSb2O9. In particular, we obtain an extended continuum above the spin wave excitations, which is further enhanced and brought closer to those observed in Ba3CoSb2O9 with the addition of a second neighbor exchange interaction approximately 15% of the nearest-neighbor value. Our results support the idea that excitation continuum with substantial spectral-weight are generically present in two-dimensional frustrated spin systems and fractionalization in terms of bosonic spinons presents an efficient way to describe them.Fil: Ghioldi, Esteban Agustín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; ArgentinaFil: Mezio, Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; ArgentinaFil: Manuel, Luis Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; ArgentinaFil: Singh, R. R. P.. University of California; Estados UnidosFil: Oitmaa, J.. University of New South Wales; AustraliaFil: Trumper, Adolfo Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; ArgentinaAmerican Physical Society2015-04info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/51075Ghioldi, Esteban Agustín; Mezio, Alejandro; Manuel, Luis Oscar; Singh, R. R. P.; Oitmaa, J.; et al.; Magnons and excitation continuum in XXZ triangular antiferromagnetic model: Application to Ba3CoSb2O9; American Physical Society; Physical Review B: Condensed Matter and Materials Physics; 91; 13; 4-2015; 1-8; 1344231098-0121CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevB.91.134423info:eu-repo/semantics/altIdentifier/url/https://journals.aps.org/prb/abstract/10.1103/PhysRevB.91.134423info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:08:45Zoai:ri.conicet.gov.ar:11336/51075instacron: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:34982025-09-29 10:08:45.758CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Magnons and excitation continuum in XXZ triangular antiferromagnetic model: Application to Ba3CoSb2O9 |
title |
Magnons and excitation continuum in XXZ triangular antiferromagnetic model: Application to Ba3CoSb2O9 |
spellingShingle |
Magnons and excitation continuum in XXZ triangular antiferromagnetic model: Application to Ba3CoSb2O9 Ghioldi, Esteban Agustín Strong Correlation Magnetic Frustration Heisenberg Model Magnons |
title_short |
Magnons and excitation continuum in XXZ triangular antiferromagnetic model: Application to Ba3CoSb2O9 |
title_full |
Magnons and excitation continuum in XXZ triangular antiferromagnetic model: Application to Ba3CoSb2O9 |
title_fullStr |
Magnons and excitation continuum in XXZ triangular antiferromagnetic model: Application to Ba3CoSb2O9 |
title_full_unstemmed |
Magnons and excitation continuum in XXZ triangular antiferromagnetic model: Application to Ba3CoSb2O9 |
title_sort |
Magnons and excitation continuum in XXZ triangular antiferromagnetic model: Application to Ba3CoSb2O9 |
dc.creator.none.fl_str_mv |
Ghioldi, Esteban Agustín Mezio, Alejandro Manuel, Luis Oscar Singh, R. R. P. Oitmaa, J. Trumper, Adolfo Emilio |
author |
Ghioldi, Esteban Agustín |
author_facet |
Ghioldi, Esteban Agustín Mezio, Alejandro Manuel, Luis Oscar Singh, R. R. P. Oitmaa, J. Trumper, Adolfo Emilio |
author_role |
author |
author2 |
Mezio, Alejandro Manuel, Luis Oscar Singh, R. R. P. Oitmaa, J. Trumper, Adolfo Emilio |
author2_role |
author author author author author |
dc.subject.none.fl_str_mv |
Strong Correlation Magnetic Frustration Heisenberg Model Magnons |
topic |
Strong Correlation Magnetic Frustration Heisenberg Model Magnons |
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 investigate the excitation spectrum of the triangular-lattice antiferromagnetic XXZ model using series expansion and mean field Schwinger boson approaches. The single-magnon spectrum computed with series expansion exhibits rotonic minima at the middle points of the edges of the Brillouin zone, for all values of the anisotropy parameter in the range 0≤Jz/J≤1. Based on the good agreement with series expansion for the single-magnon spectrum, we compute the full dynamical magnetic structure factor within the mean field Schwinger boson approach to investigate the relevance of the XXZ model for the description of the unusual spectrum found recently in Ba3CoSb2O9. In particular, we obtain an extended continuum above the spin wave excitations, which is further enhanced and brought closer to those observed in Ba3CoSb2O9 with the addition of a second neighbor exchange interaction approximately 15% of the nearest-neighbor value. Our results support the idea that excitation continuum with substantial spectral-weight are generically present in two-dimensional frustrated spin systems and fractionalization in terms of bosonic spinons presents an efficient way to describe them. Fil: Ghioldi, Esteban Agustín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentina Fil: Mezio, Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentina Fil: Manuel, Luis Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentina Fil: Singh, R. R. P.. University of California; Estados Unidos Fil: Oitmaa, J.. University of New South Wales; Australia Fil: Trumper, Adolfo Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentina |
description |
We investigate the excitation spectrum of the triangular-lattice antiferromagnetic XXZ model using series expansion and mean field Schwinger boson approaches. The single-magnon spectrum computed with series expansion exhibits rotonic minima at the middle points of the edges of the Brillouin zone, for all values of the anisotropy parameter in the range 0≤Jz/J≤1. Based on the good agreement with series expansion for the single-magnon spectrum, we compute the full dynamical magnetic structure factor within the mean field Schwinger boson approach to investigate the relevance of the XXZ model for the description of the unusual spectrum found recently in Ba3CoSb2O9. In particular, we obtain an extended continuum above the spin wave excitations, which is further enhanced and brought closer to those observed in Ba3CoSb2O9 with the addition of a second neighbor exchange interaction approximately 15% of the nearest-neighbor value. Our results support the idea that excitation continuum with substantial spectral-weight are generically present in two-dimensional frustrated spin systems and fractionalization in terms of bosonic spinons presents an efficient way to describe them. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-04 |
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/11336/51075 Ghioldi, Esteban Agustín; Mezio, Alejandro; Manuel, Luis Oscar; Singh, R. R. P.; Oitmaa, J.; et al.; Magnons and excitation continuum in XXZ triangular antiferromagnetic model: Application to Ba3CoSb2O9; American Physical Society; Physical Review B: Condensed Matter and Materials Physics; 91; 13; 4-2015; 1-8; 134423 1098-0121 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/51075 |
identifier_str_mv |
Ghioldi, Esteban Agustín; Mezio, Alejandro; Manuel, Luis Oscar; Singh, R. R. P.; Oitmaa, J.; et al.; Magnons and excitation continuum in XXZ triangular antiferromagnetic model: Application to Ba3CoSb2O9; American Physical Society; Physical Review B: Condensed Matter and Materials Physics; 91; 13; 4-2015; 1-8; 134423 1098-0121 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevB.91.134423 info:eu-repo/semantics/altIdentifier/url/https://journals.aps.org/prb/abstract/10.1103/PhysRevB.91.134423 |
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 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 |
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1844613958567198720 |
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13.070432 |