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MA 13.4: Vortrag
Montag, 16. März 2020, 15:45–16:00, HSZ 304
Nematic correlations in the coupled J1-J2 chains — •Clio Efthimia Agrapidis1, Stefan-Ludwig Drechsler2, and Satoshi Nishimoto1,3 — 1Faculty of Physics, University of Warsaw — 2Institute for theoretical solid state physics, IFW Dresden — 3Department of Physics, Technical University Dresden
It is known that the ferromagnetic frustrated J1-J2 chain is a good minimal model for several cuprate chain materials. Moreover, this model exhibits multipolar physics in magnetic field. Motivated by this, we study antiferromagnetically coupled J1-J2 chains: the interchain coupling J′ is considered to vary from pure Ising to Heisenberg exchange by varying the XXZ anisotropy parameter Δ. In general, the interchain coupling can act as an effective magnetic field. When J′ is Ising-like, the system exhibits a fully magnetised state for J′/|J1|>1. This magnetisation might be related to the existence of a nematic state. Remarkably, the system shows finite magnetisation also in the limit of Heisenberg interchain coupling.