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

Authors :
Hirai, Daigorou
Nawa, Kazuhiro
Kawamura, Mitsuaki
Misawa, Takahiro
Hiroi, Zenji
Source :
J. Phys. Soc. Jpn. 88, 044708 (2019)
Publication Year :
2019

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'/J ~ 0.32 and J = 41 K, where J and J' 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 inter-chain zigzag couplings at low temperature. Ca3ReO5Cl2 provides us with a detailed insight into the interesting physics of the ATL antiferromagnet, especially via comparison with the typical ATL compound Cs2CuCl4.<br />Comment: 9 pages, 4 figures, 1 Table

Details

Database :
arXiv
Journal :
J. Phys. Soc. Jpn. 88, 044708 (2019)
Publication Type :
Report
Accession number :
edsarx.1904.06095
Document Type :
Working Paper
Full Text :
https://doi.org/10.7566/JPSJ.88.044708