Distorted kagome antiferromagnet: Phase diagram and application to Y-kapellasite

  • We investigate the magnetism of a previously unexplored distorted spin-1/2 kagome model consisting of three symmetry-inequivalent nearest-neighbor antiferromagnetic Heisenberg couplings and uncover a rich ground state phase diagram even at the classical level. Using analytical arguments and numerical techniques we identify a collinear Q⃗ =0 magnetic phase, two unusual non-collinear coplanar Q⃗ =(1/3,1/3) phases and a classical spin liquid phase with a degenerate manifold of non-coplanar ground states, resembling the jammed spin liquid phase found in the context of a bond-disordered kagome antiferromagnet. We further show with density functional theory calculations that the recently synthesized Y-kapellasite Y3Cu9(OH)19Cl8 is a realization of this model and predict its ground state to lie in the region of Q⃗ =(1/3,1/3) order, which remains stable even after inclusion of quantum fluctuation effects within variational Monte Carlo and pseudofermion functional renormalization group. Interestingly, the excitation spectrum of Y-kapellasite lies between that of an underlying triangular lattice of hexagons and a kagome lattice of trimers. The presented model opens a new direction in the study of kagome antiferromagnets.

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Metadaten
Author:Max HeringORCiDGND, Francesco FerrariORCiD, Aleksandar RazpopovORCiD, Igor I. MazinORCiD, Roser ValentíORCiDGND, Harald O. JeschkeORCiD, Johannes ReutherORCiD
URN:urn:nbn:de:hebis:30:3-823657
URL:https://arxiv.org/abs/2107.13570v1
DOI:https://doi.org/10.48550/arXiv.2107.13570
ArXiv Id:http://arxiv.org/abs/2107.13570v1
Parent Title (English):arXiv
Publisher:arXiv
Document Type:Preprint
Language:English
Date of Publication (online):2021/07/28
Date of first Publication:2021/07/28
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2024/02/19
Issue:2107.13570 Version 1
Edition:Version 1
Page Number:19
HeBIS-PPN:516154575
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International