Antiferromagnetism in the kagome-lattice compound αCu3Mg(OH)6Br2

Yuan Wei, Zili Feng, Clarina dela Cruz, Wei Yi, Zi Yang Meng, Jia-Wei Mei, Youguo Shi, and Shiliang Li
Phys. Rev. B 100, 155129 – Published 16 October 2019
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Abstract

The antiferromagnetism in αCu3Mg(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 αCu3Mg(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.

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  • Received 1 May 2019
  • Revised 20 July 2019

DOI:https://doi.org/10.1103/PhysRevB.100.155129

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yuan Wei1,2, Zili Feng1,2, Clarina dela Cruz3, Wei Yi4, Zi Yang Meng1,5,6,7, Jia-Wei Mei8, Youguo Shi1,9,6,*, and Shiliang Li1,2,6,†

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
  • 3Neutron Scattering Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 4International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
  • 5CAS Center of Excellence in Topological Quantum Computation and School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
  • 6Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
  • 7Department of Physics, The University of Hong Kong, China
  • 8Shenzhen Institute for Quantum Science and Engineering, and Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
  • 9Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

  • *ygshi@iphy.ac.cn
  • slli@iphy.ac.cn

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Issue

Vol. 100, Iss. 15 — 15 October 2019

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