2020/06/28 by David Macdougal, Stephanie Williams, Dharmalingam Prabhakaran +7 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Atomic physics #Condensed matter physics #Excitation #Ferromagnetism #Inelastic neutron scattering #Magnetic and transport properties of perovskites and related materials #Magnon #Neutron #Neutron scattering #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Quasiparticle #Spin wave #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.102.064421
published as Phys. Rev. B 102, 064421 (2020) · 20 pages, 13 figures
arxiv created 2020/06/28 · openalex created_date 2020/07/02 · openalex publication_date 2020/08/21 · arxiv updated 2020/08/26 · openalex updated_date 2026/08/06
The authors report inelastic neutron scattering measurements to directly visualize the effects of collective quantum fluctuations in a spin-\textonehalf near-Heisenberg antiferromagnet on a triangular lattice. They observe a rich spectrum of sharp magnons at low energies with strongly renormalized dispersions and much reduced spectral weight, which are accompanied at higher energies by a very strong and highly structured continuum of excitations. The dispersion renormalizations and transfer of spectral weight to continuum states are attributed to the effect of quantum fluctuations and interactions beyond the spin-wave approximation.