Coexisting spinons and magnons in frustrated zigzag spin-1/2 chain compound $\beta$-TeVO$_4$

M. Pregelj; O. Zaharko; U. Stuhr; A. Zorko; H. Berger; A. Prokofiev; D. Arčon

doi:10.1103/PhysRevB.98.094405

Coexisting spinons and magnons in frustrated zigzag spin-1/2 chain compound $\beta$-TeVO$_4$

Strongly Correlated Electrons 2018-09-10 v1

Authors: M. Pregelj , O. Zaharko , U. Stuhr , A. Zorko , H. Berger , A. Prokofiev , D. Arčon

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Abstract

We investigate magnetic excitations in the frustrated zigzag spin-1/2 chain compound $\beta$ -TeVO $_4$ by inelastic neutron scattering. In the magnetically ordered ground state, the excitation spectrum exhibits coexisting magnon dispersion, characteristic of long-range magnetic order, and a spinon-like continuum that prevails above 2 meV, indicating the dominance of intrachain interactions. Combining linear-spin-wave-theory and pre-calculated spinon-continuum results, we reproduce the experimental spectrum. Our analysis offers a minimal exchange-network model which determines dominant intrachain interactions, their anisotropies and weak interchain interactions. The obtained parameters explain the magnetic ordering vector and spin excitations in the magnetic ground state.

Keywords

frustrated zigzag chain spin-1/2 beta-tevo4 spinon magnon inelastic neutron scattering linear spin wave theory

Cite

@article{arxiv.1808.10174,
  title  = {Coexisting spinons and magnons in frustrated zigzag spin-1/2 chain compound $\beta$-TeVO$_4$},
  author = {M. Pregelj and O. Zaharko and U. Stuhr and A. Zorko and H. Berger and A. Prokofiev and D. Arčon},
  journal= {arXiv preprint arXiv:1808.10174},
  year   = {2018}
}

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accepted for publication in PRB

Coexisting spinons and magnons in frustrated zigzag spin-1/2 chain compound $\beta$-TeVO$_4$

Abstract

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