Weakly coupled alternating S=12 chains in the distorted honeycomb lattice compound Na2Cu2TeO6

Gao, Shang; Lin, Ling-Fang; May, Andrew F.; Rai, Binod K.; Zhang, Qiang; Dagotto, Elbio; Christianson, Andrew D.; Stone, Matthew B.

doi:10.1103/physrevb.102.220402

Title: Weakly coupled alternating $S = \frac{1}{2}$ chains in the distorted honeycomb lattice compound ${Na}_{2} {Cu}_{2} {TeO}_{6}$

Journal Article · Wed Dec 02 00:00:00 EST 2020 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.102.220402· OSTI ID:1767863

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

Spin- $\frac{1}{2}$ chains with alternating antiferromagnetic (AF) and ferromagnetic (FM) couplings exhibit quantum entanglement as the integer-spin Haldane chains and might be similarly utilized for quantum computations. Such alternating AF-FM chains have been proposed to be realized in the distorted honeycomb lattice compound ${Na}_{2} {Cu}_{2} {TeO}_{6}$ , but to confirm this picture a comprehensive understanding of the exchange interactions including terms outside of the idealized model is required. Here, we employ neutron scattering to study the spin dynamics in ${Na}_{2} {Cu}_{2} {TeO}_{6}$ and accurately determine the coupling strengths through the random phase approximation and density functional theory approaches. We find the AF and FM intrachain couplings are the dominant terms in the spin Hamiltonian, while the interchain couplings are AF but perturbative. This hierarchy in the coupling strengths and the alternating signs of the intrachain couplings can be understood through their different exchange paths. Our results establish ${Na}_{2} {Cu}_{2} {TeO}_{6}$ as a weakly coupled alternating AF-FM chain compound and reveal the robustness of the gapped ground state in alternating chains under weak interchain couplings.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1767863

Journal Information:: Physical Review B, Vol. 102, Issue 22; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Weakly coupled alternating S = 1 2 chains in the distorted honeycomb lattice compound Na 2 Cu 2 TeO 6

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Title: Weakly coupled alternating $S = \frac{1}{2}$ chains in the distorted honeycomb lattice compound ${Na}_{2} {Cu}_{2} {TeO}_{6}$