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arXiv · 1906.10020

Steplike metamagnetic transitions in a honeycomb lattice antiferromagnet Tb$_2$Ir$_3$Ga$_9$

Mojammel A. Khan·Qiang Zhang·Jin-Ke Bao·Randy S. Fishman·Antia S. Botana·Y. Choi·G. Fabbris·D. Haskel·John Singleton·John F. Mitchell
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Abstract

Single crystals of a honeycomb lattice antiferromagnet, Tb$_2$Ir$_3$Ga$_9$ were synthesized, and the physical properties have been studied. From magnetometry, a long-range antiferromagnetic ordering at $\approx$12.5 K with highly anisotropic magnetic behavior was found. Neutron powder diffraction confirms that the Tb spins lie along the $\va $-axis, parallel to the shortest Tb-Tb contact. Two field-induced spin-flip transitions are observed when the field is applied parallel to this axis, separated by a plateau corresponding roughly to M$\approx$M$_{\rm{s}}$/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 Tb$^{3+}$ ion in a site of \textit{C$_s$} symmetry and expressing a significant bond dependent anisotropy.

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Mojammel A. Khan, Qiang Zhang, Jin-Ke Bao, Randy S. Fishman, Antia S. Botana, Y. Choi, G. Fabbris, D. Haskel, John Singleton, John F. Mitchell. 2019-06-24. Steplike metamagnetic transitions in a honeycomb lattice antiferromagnet Tb$_2$Ir$_3$Ga$_9$. https://doi.org/10.1103/physrevmaterials.3.114411

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