Regensburg 2022 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 23: Frustrated Magnets - General

TT 23.1: Vortrag

Mittwoch, 7. September 2022, 15:00–15:15, H22

Numerical linked cluster expansion for magnetostriction of frustrated magnets — •Alexander Schwenke and Wolfram Brenig — Institute for Theoretical Physics, Technical University Braunschweig, D-38106 Braunschweig, Germany

Thermodynamic and magnetoelastic properties of the frustrated J-K-Γ quantum spin model for proximate Kitaev magnets on the honeycomb lattice in a finite magnetic field B^→ are studied using the numerical linked cluster expansion (NLCE) [1]. Calculations are performed on clusters of sizes up to ∼O(11). First, the specific heat and the magnetization are analyzed for in- as well as for out-of-plane configurations of B^→. Second, we present results of the linear magnetostriction coefficient λ(B^→,T). This displays strongly anisotropic behavior and a clear indication for a field-induced transition. Third, employing exchange parameters as proposed for the proximate quantum spin-liquid (QSL) candidate α-RuCl₃, we show that our results for λ are very similar to recently observed experimental data [2] on this material.

[1] M. Rigol et al., Phys. Rev. Lett. 97, 187202 (2006)

[2] V. Kocsis et al., Phys. Rev. B 105, 094410 (2022)