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 language | English (US) |
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Article number | 114411 |
Journal | Physical Review Materials |
Volume | 3 |
Issue number | 11 |
DOIs | |
State | Published - Nov 21 2019 |
ASJC Scopus subject areas
- General Materials Science
- Physics and Astronomy (miscellaneous)