One-dimensionalization by Geometrical Frustration in the Anisotropic Triangular Lattice of the 5d Quantum Antiferromagnet Ca3ReO5Cl2

Daigorou Hirai, Kazuhiro Nawa, Mitsuaki Kawamura, Takahiro Misawa, Zenji Hiroi

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2 Citations (Scopus)

Abstract

We report on the emergence of antiferromagnetic spin chains from two-dimensionally aligned spins on the anisotropic triangular lattice (ATL) in the insulating calcium rhenium oxychloride Ca3ReO5Cl2. The compound contains Re6+ ions, each with one unpaired electron in the dxy orbital, which are arranged to form a spin-1=2 ATL with J A=J ∼ 0.32 and J = 41 K, where J and J A are magnetic interactions in and between the chains, respectively. In spite of the apparent two-dimensionality, we observe clear evidence of a gapless spin liquid that is characteristic of the spin-1=2 Heisenberg chain. This one-dimensionalization must be caused by geometrical frustration: growing antiferromagnetic correlations in every chain effectively cancel out interchain zigzag couplings at low temperatures. Ca3ReO5Cl2 provides us with a detailed insight into the interesting physics of the ATL antiferromagnet, especially via comparison with the typical ATL compound Cs2CuCl4

Original languageEnglish
Article number044708
Journaljournal of the physical society of japan
Volume88
Issue number4
DOIs
Publication statusPublished - 2019
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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