SKM 2021 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 18: Frustrated Magnets
TT 18.1: Talk
Thursday, September 30, 2021, 10:00–10:15, H7
Magnon Crystallization in the Kagome Lattice Antiferromagnet — •Jürgen Schnack1, Jörg Schulenburg2, Andreas Honecker3, and Johannes Richter4 — 1Fakultät für Physik, Universität Bielefeld, Postfach 100131, D-33501 Bielefeld, Germany — 2Universitätsrechenzentrum, Universität Magdeburg, D-39016 Magdeburg, Germany — 3Laboratoire de Physique Theorique et Modelisation, CNRS UMR 8089, CY Cergy Paris Universite, F-95302 Cergy-Pontoise Cedex, France — 4Institut für Physik, Universität Magdeburg, P.O. Box 4120, D-39016 Magdeburg, Germany & Max-Planck-Institut für Physik Komplexer Systeme, Nöthnitzer Straße 38, D-01187 Dresden, Germany
We present numerical evidence for the crystallization of magnons below the saturation field at nonzero temperatures for the highly frustrated spin-half kagome Heisenberg antiferromagnet [Phys. Rev. Lett. 125, 117207 (2020)]. This phenomenon can be traced back to the existence of independent localized magnons or, equivalently, flatband multimagnon states. We present a loop-gas description of these localized magnons and a phase diagram of this transition, thus providing information for which magnetic fields and temperatures magnon crystallization can be observed experimentally. The emergence of a finite-temperature continuous transition to a magnon crystal is expected to be generic for spin models in dimension D > 1 where flatband multimagnon ground states break translational symmetry.