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Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 23: Frustrated Magnets - General 1 (joint session TT/MA)

TT 23.13: Vortrag

Dienstag, 2. April 2019, 12:45–13:00, Theater

Magnetism of the N = 42 kagome lattice antiferromagnet — •Jürgen Schnack1, Jörg Schulenburg2, and Johannes Richter31Fakultät für Physik, Universität Bielefeld, Postfach 100131, D-33501 Bielefeld, Germany — 2Universitätsrechenzentrum, Universität Magdeburg, D-39016 Magdeburg, Germany — 3Institut für Physik, Universität Magdeburg, P.O. Box 4120, D-39016 Magdeburg, Germany and Max-Planck-Institut für Physik Komplexer Systeme, Nöthnitzer Straße 38, 01187 Dresden, Germany

For the paradigmatic frustrated spin-half Heisenberg antiferromagnet on the kagome lattice we performed large-scale numerical investigations of thermodynamic functions by means of the finite-temperature Lanczos method for system sizes of up to N = 42 [1]. We present the dependence of magnetization as well as specific heat on temperature and external field and show in particular that a finite-size scaling of specific heat supports the appearance of a low-temperature shoulder below the major maximum. This seems to be the result of a counterintuitive motion of the density of singlet states towards higher energies. Other interesting features that we discuss are the asymmetric melting of the 1/3 magnetization plateau as well the field dependence of the specific heat that exhibits characteristic features caused by the existence of a flat one-magnon band. By comparison with the unfrustrated square-lattice antiferromagnet the tremendous role of frustration in a wide temperature range is illustrated.
Phys. Rev. B 98, 094423 (2018)

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