Resolution of zigzag magnetic correlations in Na-deficient NaxIrO3 without long-range ordering

Kim, Jungho; Zhao, Hengdi; Cao, Gang

doi:10.1103/physrevb.106.075157

Title: Resolution of zigzag magnetic correlations in Na-deficient Na x IrO 3 without long-range ordering

Journal Article · Wed Aug 31 00:00:00 EDT 2022 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.106.075157· OSTI ID:1909595

^[1];

^[2]; Cao, Gang ^[2]

Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Univ. of Colorado, Boulder, CO (United States)

The materials search for Kitaev quantum spin liquids led to the discovery of many honeycomb lattice materials. Much attention has been paid to materials without magnetic order down to the lowest temperatures. The newly synthesized Na-deficient Na_xIrO₃ has been found to bear no sign of long-range magnetic order above 1 K from physical property measurements. In this paper, we report momentum-and energy-resolved excitation spectra in Na-deficient Na_xIrO₃ measured using a resonant inelastic x-ray scattering spectrometer. Orbital excitation spectra show that the octahedral and trigonal crystal field splittings are larger in Na_xIrO₃ than in Na₂IrO₃. On the other hand, the low-energy spectrum at low temperature shows a wave-vector dispersion and a spectral weight distribution that are similar to those of Na₂IrO₃, revealing that the two-dimensional zigzag magnetic correlations in Na_xIrO₃ are similar to those in Na₂IrO₃ in terms of the ordered magnetic moment direction and three dynamically fluctuating zigzag orders. The azimuth angle dependence of the low-energy spectrum corroborates these results. The two-dimensional zigzag magnetic correlations rapidly weaken until 50 K. At high temperatures, the spectral weight distribution of the low-energy excitation resembles that of the pure Kitaev model, indicating that the Kitaev interaction dominates the dynamic magnetic response at high temperature. Here we suggest that the larger crystal field and distortion and the weakened longer-range Heisenberg exchange interactions due to the Na deficiency in Na_xIrO₃ contribute to bring Na_xIrO₃ away from the zigzag long-range magnetic order phase.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC); Czech Science Foundation (GA CR); National Science Foundation (NSF)

Grant/Contract Number:: AC02-06CH11357; DMR 1903888

OSTI ID:: 1909595

Journal Information:: Physical Review. B, Vol. 106, Issue 7; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Resolution of zigzag magnetic correlations in Na-deficient Na x IrO 3 without long-range ordering

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