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Anomalous continuum scattering and higher-order van Hove singularity in the strongly anisotropic S = 1/2 triangular lattice antiferromagnet.
Park, Pyeongjae; Ghioldi, E A; May, Andrew F; Kolopus, James A; Podlesnyak, Andrey A; Calder, Stuart; Paddison, Joseph A M; Trumper, A E; Manuel, L O; Batista, Cristian D; Stone, Matthew B; Halász, Gábor B; Christianson, Andrew D.
Afiliación
  • Park P; Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA. parkp@ornl.gov.
  • Ghioldi EA; Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, USA.
  • May AF; Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA.
  • Kolopus JA; Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA.
  • Podlesnyak AA; Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA.
  • Calder S; Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA.
  • Paddison JAM; Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA.
  • Trumper AE; Instituto de Física Rosario (CONICET) and Universidad Nacional de Rosario, Rosario, Argentina.
  • Manuel LO; Instituto de Física Rosario (CONICET) and Universidad Nacional de Rosario, Rosario, Argentina.
  • Batista CD; Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, USA.
  • Stone MB; Neutron Scattering Division and Shull-Wollan Center, Oak Ridge National Laboratory, Oak Ridge, TN, USA.
  • Halász GB; Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA. stonemb@ornl.gov.
  • Christianson AD; Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA. halaszg@ornl.gov.
Nat Commun ; 15(1): 7264, 2024 Aug 23.
Article en En | MEDLINE | ID: mdl-39179624
ABSTRACT
The S = 1/2 triangular lattice antiferromagnet (TLAF) is a paradigmatic example of frustrated quantum magnetism. An ongoing challenge involves understanding the influence of exchange anisotropy on the collective behavior within such systems. Using inelastic neutron scattering (INS) and advanced calculation techniques, we have studied the low and high-temperature spin dynamics of Ba2La2CoTe2O12 (BLCTO) a Co2+-based Jeff = 1/2 TLAF that exhibits 120° order below TN = 3.26 K. We determined the spin Hamiltonian by fitting the energy-resolved paramagnetic excitations measured at T > TN, revealing exceptionally strong easy-plane XXZ anisotropy. Below TN, the excitation spectrum exhibits a high energy continuum having a larger spectral weight than the single-magnon modes, suggesting a scenario characterized by a spinon confinement length that markedly exceeds the lattice spacing. We conjecture that this phenomenon arises from the proximity to a quantum melting point, even under strong easy-plane XXZ anisotropy. Finally, we highlight characteristic flat features in the excitation spectrum, which are connected to higher-order van Hove singularities in the magnon dispersion directly induced by easy-plane XXZ anisotropy. Our results provide a rare experimental insight into the nature of highly anisotropic S = 1/2 TLAFs between the Heisenberg and XY limits.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nat Commun Asunto de la revista: BIOLOGIA / CIENCIA Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nat Commun Asunto de la revista: BIOLOGIA / CIENCIA Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido