Abstract
The antiferromagnetism in was studied by magnetic-susceptibility, specific-heat, and neutron-diffraction measurements. The crystal structure consists of kagome layers with ions occupying the centers of the hexagons, separated by ions. The magnetic system orders antiferromagnetically at 5.4 K with the magnetic moments aligned ferromagnetically within the kagome planes. The ordered moment is , suggesting little quantum and geometrical fluctuations. By comparing the magnetic and specific-heat properties with those of the haydeeite, we suggest that may be described by the two-dimensional spin- Heisenberg kagome model and is in the region of the ferromagnetic-order side of the phase diagram.
- Received 1 May 2019
- Revised 20 July 2019
DOI:https://doi.org/10.1103/PhysRevB.100.155129
©2019 American Physical Society