Anomalous continuum scattering and higher-order van Hove singularity in the strongly anisotropic S = 1/2 triangular lattice antiferromagnet

Autores
Park, Pyeongjae; Ghioldi, Esteban Agustín; May, Andrew F.; Kolopus, James A.; Podlesnyak, Andrey A.; Calder, Stuart; Paddison, Joseph A. M.; Trumper, Adolfo Emilio; Manuel, Luis Oscar; Batista, Cristian D.; Stone, Matthew B.; Halász, Gábor B.; Christianson, Andrew D.
Año de publicación
2024
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The S = 1/2 triangular lattice antiferromagnet (TLAF) is a paradigmatic exampleof frustrated quantum magnetism. An ongoing challenge involves under-standing the influence of exchange anisotropy on the collective behaviorwithin such systems. Using inelastic neutron scattering (INS) and advancedcalculation techniques, we have studied the low and high-temperature spindynamics of Ba2La 2CoTe2O 12 (BLCTO): a Co2+-based Jeff = 1/2 TLAF that exhibits120° order below T_ N = 3.26 K. We determined the spin Hamiltonian by fittingthe energy-resolved paramagnetic excitations measured at T > T_N, revealingexceptionally strong easy-plane XXZ anisotropy. Below T_N , the excitationspectrum exhibits a high energy continuum having a larger spectral weightthan the single-magnon modes, suggesting a scenario characterized by a spi-non confinement length that markedly exceeds the lattice spacing. We con-jecture that this phenomenon arises from the proximity to a quantum meltingpoint, even under strong easy-plane XXZ anisotropy. Finally, we highlightcharacteristic flat features in the excitation spectrum, which are connected tohigher-order van Hove singularities in the magnon dispersion directly inducedby easy-plane XXZ anisotropy. Our results provide a rare experimental insightinto the nature of highly anisotropic S = 1/2 TLAFs between the Heisenberg andXY limits.
Fil: Park, Pyeongjae. Oak Ridge National Laboratory; Estados Unidos
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. University of Tennessee; Estados Unidos
Fil: May, Andrew F.. Oak Ridge National Laboratory; Estados Unidos
Fil: Kolopus, James A.. Oak Ridge National Laboratory; Estados Unidos
Fil: Podlesnyak, Andrey A.. Oak Ridge National Laboratory; Estados Unidos
Fil: Calder, Stuart. Oak Ridge National Laboratory; Estados Unidos
Fil: Paddison, Joseph A. M.. Oak Ridge National Laboratory; Estados Unidos
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
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: Batista, Cristian D.. Oak Ridge National Laboratory; Estados Unidos. University of Tennessee; Estados Unidos
Fil: Stone, Matthew B.. Oak Ridge National Laboratory; Estados Unidos
Fil: Halász, Gábor B.. Oak Ridge National Laboratory; Estados Unidos
Fil: Christianson, Andrew D.. Oak Ridge National Laboratory; Estados Unidos
Materia
FRUSTRATION
ANTIFERROMAGNETISM
DYNAMICAL STRUCTURE FACTOR
NEUTRON SCATTERING EXPERIMENT
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/264170
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/264170
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Anomalous continuum scattering and higher-order van Hove singularity in the strongly anisotropic S = 1/2 triangular lattice antiferromagnetPark, PyeongjaeGhioldi, Esteban AgustínMay, Andrew F.Kolopus, James A.Podlesnyak, Andrey A.Calder, StuartPaddison, Joseph A. M.Trumper, Adolfo EmilioManuel, Luis OscarBatista, Cristian D.Stone, Matthew B.Halász, Gábor B.Christianson, Andrew D.FRUSTRATIONANTIFERROMAGNETISMDYNAMICAL STRUCTURE FACTORNEUTRON SCATTERING EXPERIMENThttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1The S = 1/2 triangular lattice antiferromagnet (TLAF) is a paradigmatic exampleof frustrated quantum magnetism. An ongoing challenge involves under-standing the influence of exchange anisotropy on the collective behaviorwithin such systems. Using inelastic neutron scattering (INS) and advancedcalculation techniques, we have studied the low and high-temperature spindynamics of Ba2La 2CoTe2O 12 (BLCTO): a Co2+-based Jeff = 1/2 TLAF that exhibits120° order below T_ N = 3.26 K. We determined the spin Hamiltonian by fittingthe energy-resolved paramagnetic excitations measured at T > T_N, revealingexceptionally strong easy-plane XXZ anisotropy. Below T_N , the excitationspectrum exhibits a high energy continuum having a larger spectral weightthan the single-magnon modes, suggesting a scenario characterized by a spi-non confinement length that markedly exceeds the lattice spacing. We con-jecture that this phenomenon arises from the proximity to a quantum meltingpoint, even under strong easy-plane XXZ anisotropy. Finally, we highlightcharacteristic flat features in the excitation spectrum, which are connected tohigher-order van Hove singularities in the magnon dispersion directly inducedby easy-plane XXZ anisotropy. Our results provide a rare experimental insightinto the nature of highly anisotropic S = 1/2 TLAFs between the Heisenberg andXY limits.Fil: Park, Pyeongjae. Oak Ridge National Laboratory; Estados UnidosFil: 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. University of Tennessee; Estados UnidosFil: May, Andrew F.. Oak Ridge National Laboratory; Estados UnidosFil: Kolopus, James A.. Oak Ridge National Laboratory; Estados UnidosFil: Podlesnyak, Andrey A.. Oak Ridge National Laboratory; Estados UnidosFil: Calder, Stuart. Oak Ridge National Laboratory; Estados UnidosFil: Paddison, Joseph A. M.. Oak Ridge National Laboratory; Estados UnidosFil: 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; 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: Batista, Cristian D.. Oak Ridge National Laboratory; Estados Unidos. University of Tennessee; Estados UnidosFil: Stone, Matthew B.. Oak Ridge National Laboratory; Estados UnidosFil: Halász, Gábor B.. Oak Ridge National Laboratory; Estados UnidosFil: Christianson, Andrew D.. Oak Ridge National Laboratory; Estados UnidosNature Publishing Group2024-08info: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/11336/264170Park, Pyeongjae; Ghioldi, Esteban Agustín; May, Andrew F.; Kolopus, James A.; Podlesnyak, Andrey A.; et al.; Anomalous continuum scattering and higher-order van Hove singularity in the strongly anisotropic S = 1/2 triangular lattice antiferromagnet; Nature Publishing Group; Nature Communications; 15; 1; 8-2024; 7264-72642041-1723CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.nature.com/articles/s41467-024-51618-winfo:eu-repo/semantics/altIdentifier/doi/10.1038/s41467-024-51618-winfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:45:27Zoai:ri.conicet.gov.ar:11336/264170instacron: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 10:45:27.328CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Anomalous continuum scattering and higher-order van Hove singularity in the strongly anisotropic S = 1/2 triangular lattice antiferromagnet
title Anomalous continuum scattering and higher-order van Hove singularity in the strongly anisotropic S = 1/2 triangular lattice antiferromagnet
spellingShingle Anomalous continuum scattering and higher-order van Hove singularity in the strongly anisotropic S = 1/2 triangular lattice antiferromagnet
Park, Pyeongjae
FRUSTRATION
ANTIFERROMAGNETISM
DYNAMICAL STRUCTURE FACTOR
NEUTRON SCATTERING EXPERIMENT
title_short Anomalous continuum scattering and higher-order van Hove singularity in the strongly anisotropic S = 1/2 triangular lattice antiferromagnet
title_full Anomalous continuum scattering and higher-order van Hove singularity in the strongly anisotropic S = 1/2 triangular lattice antiferromagnet
title_fullStr Anomalous continuum scattering and higher-order van Hove singularity in the strongly anisotropic S = 1/2 triangular lattice antiferromagnet
title_full_unstemmed Anomalous continuum scattering and higher-order van Hove singularity in the strongly anisotropic S = 1/2 triangular lattice antiferromagnet
title_sort Anomalous continuum scattering and higher-order van Hove singularity in the strongly anisotropic S = 1/2 triangular lattice antiferromagnet
dc.creator.none.fl_str_mv Park, Pyeongjae
Ghioldi, Esteban Agustín
May, Andrew F.
Kolopus, James A.
Podlesnyak, Andrey A.
Calder, Stuart
Paddison, Joseph A. M.
Trumper, Adolfo Emilio
Manuel, Luis Oscar
Batista, Cristian D.
Stone, Matthew B.
Halász, Gábor B.
Christianson, Andrew D.
author Park, Pyeongjae
author_facet Park, Pyeongjae
Ghioldi, Esteban Agustín
May, Andrew F.
Kolopus, James A.
Podlesnyak, Andrey A.
Calder, Stuart
Paddison, Joseph A. M.
Trumper, Adolfo Emilio
Manuel, Luis Oscar
Batista, Cristian D.
Stone, Matthew B.
Halász, Gábor B.
Christianson, Andrew D.
author_role author
author2 Ghioldi, Esteban Agustín
May, Andrew F.
Kolopus, James A.
Podlesnyak, Andrey A.
Calder, Stuart
Paddison, Joseph A. M.
Trumper, Adolfo Emilio
Manuel, Luis Oscar
Batista, Cristian D.
Stone, Matthew B.
Halász, Gábor B.
Christianson, Andrew D.
author2_role author
author
author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv FRUSTRATION
ANTIFERROMAGNETISM
DYNAMICAL STRUCTURE FACTOR
NEUTRON SCATTERING EXPERIMENT
topic FRUSTRATION
ANTIFERROMAGNETISM
DYNAMICAL STRUCTURE FACTOR
NEUTRON SCATTERING EXPERIMENT
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 S = 1/2 triangular lattice antiferromagnet (TLAF) is a paradigmatic exampleof frustrated quantum magnetism. An ongoing challenge involves under-standing the influence of exchange anisotropy on the collective behaviorwithin such systems. Using inelastic neutron scattering (INS) and advancedcalculation techniques, we have studied the low and high-temperature spindynamics of Ba2La 2CoTe2O 12 (BLCTO): a Co2+-based Jeff = 1/2 TLAF that exhibits120° order below T_ N = 3.26 K. We determined the spin Hamiltonian by fittingthe energy-resolved paramagnetic excitations measured at T > T_N, revealingexceptionally strong easy-plane XXZ anisotropy. Below T_N , the excitationspectrum exhibits a high energy continuum having a larger spectral weightthan the single-magnon modes, suggesting a scenario characterized by a spi-non confinement length that markedly exceeds the lattice spacing. We con-jecture that this phenomenon arises from the proximity to a quantum meltingpoint, even under strong easy-plane XXZ anisotropy. Finally, we highlightcharacteristic flat features in the excitation spectrum, which are connected tohigher-order van Hove singularities in the magnon dispersion directly inducedby easy-plane XXZ anisotropy. Our results provide a rare experimental insightinto the nature of highly anisotropic S = 1/2 TLAFs between the Heisenberg andXY limits.
Fil: Park, Pyeongjae. Oak Ridge National Laboratory; Estados Unidos
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. University of Tennessee; Estados Unidos
Fil: May, Andrew F.. Oak Ridge National Laboratory; Estados Unidos
Fil: Kolopus, James A.. Oak Ridge National Laboratory; Estados Unidos
Fil: Podlesnyak, Andrey A.. Oak Ridge National Laboratory; Estados Unidos
Fil: Calder, Stuart. Oak Ridge National Laboratory; Estados Unidos
Fil: Paddison, Joseph A. M.. Oak Ridge National Laboratory; Estados Unidos
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
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: Batista, Cristian D.. Oak Ridge National Laboratory; Estados Unidos. University of Tennessee; Estados Unidos
Fil: Stone, Matthew B.. Oak Ridge National Laboratory; Estados Unidos
Fil: Halász, Gábor B.. Oak Ridge National Laboratory; Estados Unidos
Fil: Christianson, Andrew D.. Oak Ridge National Laboratory; Estados Unidos
description The S = 1/2 triangular lattice antiferromagnet (TLAF) is a paradigmatic exampleof frustrated quantum magnetism. An ongoing challenge involves under-standing the influence of exchange anisotropy on the collective behaviorwithin such systems. Using inelastic neutron scattering (INS) and advancedcalculation techniques, we have studied the low and high-temperature spindynamics of Ba2La 2CoTe2O 12 (BLCTO): a Co2+-based Jeff = 1/2 TLAF that exhibits120° order below T_ N = 3.26 K. We determined the spin Hamiltonian by fittingthe energy-resolved paramagnetic excitations measured at T > T_N, revealingexceptionally strong easy-plane XXZ anisotropy. Below T_N , the excitationspectrum exhibits a high energy continuum having a larger spectral weightthan the single-magnon modes, suggesting a scenario characterized by a spi-non confinement length that markedly exceeds the lattice spacing. We con-jecture that this phenomenon arises from the proximity to a quantum meltingpoint, even under strong easy-plane XXZ anisotropy. Finally, we highlightcharacteristic flat features in the excitation spectrum, which are connected tohigher-order van Hove singularities in the magnon dispersion directly inducedby easy-plane XXZ anisotropy. Our results provide a rare experimental insightinto the nature of highly anisotropic S = 1/2 TLAFs between the Heisenberg andXY limits.
publishDate 2024
dc.date.none.fl_str_mv 2024-08
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/11336/264170
Park, Pyeongjae; Ghioldi, Esteban Agustín; May, Andrew F.; Kolopus, James A.; Podlesnyak, Andrey A.; et al.; Anomalous continuum scattering and higher-order van Hove singularity in the strongly anisotropic S = 1/2 triangular lattice antiferromagnet; Nature Publishing Group; Nature Communications; 15; 1; 8-2024; 7264-7264
2041-1723
CONICET Digital
CONICET
url http://hdl.handle.net/11336/264170
identifier_str_mv Park, Pyeongjae; Ghioldi, Esteban Agustín; May, Andrew F.; Kolopus, James A.; Podlesnyak, Andrey A.; et al.; Anomalous continuum scattering and higher-order van Hove singularity in the strongly anisotropic S = 1/2 triangular lattice antiferromagnet; Nature Publishing Group; Nature Communications; 15; 1; 8-2024; 7264-7264
2041-1723
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://www.nature.com/articles/s41467-024-51618-w
info:eu-repo/semantics/altIdentifier/doi/10.1038/s41467-024-51618-w
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-nd/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 Nature Publishing Group
publisher.none.fl_str_mv Nature Publishing Group
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 13.070432

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