Abstract
The antiferromagnetism in α-Cu3Mg(OH)6Br2 was studied by magnetic-susceptibility, specific-heat, and neutron-diffraction measurements. The crystal structure consists of Cu2+ kagome layers with Mg2+ ions occupying the centers of the hexagons, separated by Br1-ions. The magnetic system orders antiferromagnetically at 5.4 K with the magnetic moments aligned ferromagnetically within the kagome planes. The ordered moment is 0.94μB, suggesting little quantum and geometrical fluctuations. By comparing the magnetic and specific-heat properties with those of the haydeeite, we suggest that α-Cu3Mg(OH)6Br2 may be described by the two-dimensional spin-1/2 Heisenberg kagome model and is in the region of the ferromagnetic-order side of the phase diagram.
| Original language | English |
|---|---|
| Article number | 155129 |
| Journal | Physical Review B |
| Volume | 100 |
| Issue number | 15 |
| DOIs | |
| State | Published - Oct 16 2019 |
Funding
This work is supported by The National Key Research and Development Program of China (Grants No. 2017YFA0302900, No. 2016YFA0300502, and No. 2016YFA0300604), the National Natural Science Foundation of China (Grants No. 11874401, No. 11674406, No. 11574359, No. 11674370, and No. 11774399), the Strategic Priority Research Program(B) of the Chinese Academy of Sciences (Grants No. XDB25000000, No. XDB07020000, and No. XDB28000000), Beijing Natural Science Foundation (Grant No. Z180008), Guangdong Introducing Innovative and Entrepreneurial Teams (Grant No. 2017ZT07C062), and the National Thousand-Young Talents Program of China. Research conducted at ORNL's High Flux Isotope Reactor was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. Y.W. and Z.F. contributed equally to this work.