Abstract
We investigate the low temperature magnetic properties of a Heisenberg kagome antiferromagnet, the layered monodiphosphate , using magnetization measurements and nuclear magnetic resonance. An antiferromagnetic-type order sets in at and a characteristic magnetization plateau is observed at of the saturation magnetization below . A moderate NMR line broadening reveals the development of anisotropic short-range correlations concomitantly with a gapless spin-lattice relaxation time , which may point to the presence of a semiclassical nematic spin-liquid state predicted for the Heisenberg kagome antiferromagnetic model or to the persistence of the zero-energy modes of the kagome lattice under large magnetic fields.
- Received 4 February 2021
- Revised 14 July 2021
- Accepted 16 September 2021
DOI:https://doi.org/10.1103/PhysRevLett.127.157202
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