Anisotropy-governed competition of magnetic phases in the honeycomb quantum magnet Na3Ni2SbO6 studied by dilatometry and high-frequency ESR

Thermodynamic properties and low-energy magnon excitations of S=1 honeycomb-layered Na3Ni2SbO6 have been investigated by high-resolution dilatometry, static magnetization, and high-frequency electron spin resonance studies in magnetic fields up to 16 T. At TN = 16.5 K, there is a tricritical point s...

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Main Authors: Werner, Johannes (Author) , Hergett, Waldemar (Author) , Gertig, Mario (Author) , Park, Jaena (Author) , Koo, Changhyun (Author) , Klingeler, Rüdiger (Author)
Format: Article (Journal)
Language:English
Published: 20 June 2017
In: Physical review
Year: 2017, Volume: 95, Issue: 21
ISSN:2469-9969
DOI:10.1103/PhysRevB.95.214414
Online Access:Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevB.95.214414
Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.95.214414
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Author Notes:J. Werner, W. Hergett, M. Gertig, J. Park, C. Koo, and R. Klingeler

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520 |a Thermodynamic properties and low-energy magnon excitations of S=1 honeycomb-layered Na3Ni2SbO6 have been investigated by high-resolution dilatometry, static magnetization, and high-frequency electron spin resonance studies in magnetic fields up to 16 T. At TN = 16.5 K, there is a tricritical point separating two distinct antiferromagnetic phases, AF1 and AF2, from the paramagnetic regime. In addition, our data imply short-range antiferromagnetic correlations at least up to ∼5TN. Well below TN, the magnetic field BC1≈9.5 T is needed to stabilize AF2 against AF1. The thermal expansion and magnetostriction anomalies at TN and BC1 imply significant magnetoelastic coupling, both of which are associated with a sign change of ∂L/∂B. The transition at BC1 is associated with softening of the antiferromagnetic resonance modes observed in the electron-spin-resonance spectra. The anisotropy gap Δ=360 GHz implies considerable uniaxial anisotropy. We deduce the crucial role of axial anisotropy favoring the AF1 spin structure over the AF2 one. While the magnetostriction data disprove a simple spin-flop scenario at BC1, the nature of a second transition at BC2 ≈ 13 T remains unclear. Both the sign of the magnetostriction and Grüneisen analysis suggest that the short-range correlations at high temperatures are of AF2 type. 
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