Abstract
We report x-ray diffraction, magnetic susceptibility, heat capacity, nuclear magnetic resonance (NMR), and muon spin relaxation measurements, as well as density-functional band-structure calculations for the frustrated triangular lattice Heisenberg antiferromagnet (TLHAF) (trigonal, space group: ). This compound undergoes a clear magnetic transition at K, as seen from the drop in the muon paramagnetic fraction and concurrent anomalies in the magnetic susceptibility and specific heat capacity. Local probes (NMR and ) reveal a broad regime with slow fluctuations down to , this temperature corresponding to the maximum in the relaxation rate and in the NMR wipe-out. From the comparison with and , the fluctuating regime and slow dynamics below appear to be hallmarks of the TLHAF with stacking. We discuss the role of interlayer frustration, which may have impacted recent spin-liquid candidates with triangular geometry.
4 More- Received 22 June 2021
- Revised 7 September 2021
- Accepted 9 September 2021
DOI:https://doi.org/10.1103/PhysRevB.104.104422
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