Steplike metamagnetic transitions in a honeycomb lattice antiferromagnet Tb2Ir3Ga9

Mojammel A. Khan, Qiang Zhang, Jin Ke Bao, Randy S. Fishman, A. S. Botana, Y. Choi, G. Fabbris, D. Haskel, John Singleton, J. F. Mitchell

Research output: Contribution to journalArticle

Abstract

Single crystals of a honeycomb lattice antiferromagnet, Tb2Ir3Ga9, were synthesized, and the physical properties have been studied. From magnetometry, a long-range antiferromagnetic ordering at ≈12.5 K with highly anisotropic magnetic behavior was found. Neutron powder diffraction confirms that the Tb spins lie along the a-axis, parallel to the shortest Tb-Tb contact. Two field-induced spin-flip transitions are observed when the field is applied parallel to this axis, separated by a plateau corresponding roughly to M≈Ms/2. Transport measurements show the resistivity to be metallic with a discontinuity at the onset of Néel order. Heat capacity shows a λ-like transition confirming the bulk nature of the magnetism. We propose a phenomenological spin Hamiltonian that describes the magnetization plateau as a result of strong Ising character arising from a quasidoublet ground state of the Tb3+ ion in a site of Cs symmetry and expressing a significant bond-dependent anisotropy.

Original languageEnglish (US)
Article number114411
JournalPhysical Review Materials
Volume3
Issue number11
DOIs
StatePublished - Nov 21 2019

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)

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    Khan, M. A., Zhang, Q., Bao, J. K., Fishman, R. S., Botana, A. S., Choi, Y., Fabbris, G., Haskel, D., Singleton, J., & Mitchell, J. F. (2019). Steplike metamagnetic transitions in a honeycomb lattice antiferromagnet Tb2Ir3Ga9. Physical Review Materials, 3(11), [114411]. https://doi.org/10.1103/PhysRevMaterials.3.114411