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Title: Steplike metamagnetic transitions in a honeycomb lattice antiferromagnet Tb 2 Ir 3 Ga 9

Abstract

Single crystals of a honeycomb lattice antiferromagnet, Tb 2Ir 3Ga 9, 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 ≈ M 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 C s symmetry and expressing a significant bond-dependent anisotropy.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [1];  [3];  [4];  [5];  [5];  [5]; ORCiD logo [6]; ORCiD logo [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
  4. Arizona State Univ., Tempe, AZ (United States). Dept. of Physics
  5. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  6. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Science Foundation (NSF)
OSTI Identifier:
1574982
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 3; Journal Issue: 11; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Khan, Mojammel A., Zhang, Qiang, Bao, Jin-Ke, Fishman, Randy S., Botana, A. S., Choi, Y., Fabbris, G., Haskel, D., Singleton, John, and Mitchell, J. F. Steplike metamagnetic transitions in a honeycomb lattice antiferromagnet Tb2Ir3Ga9. United States: N. p., 2019. Web. doi:10.1103/PhysRevMaterials.3.114411.
Khan, Mojammel A., Zhang, Qiang, Bao, Jin-Ke, Fishman, Randy S., Botana, A. S., Choi, Y., Fabbris, G., Haskel, D., Singleton, John, & Mitchell, J. F. Steplike metamagnetic transitions in a honeycomb lattice antiferromagnet Tb2Ir3Ga9. United States. doi:10.1103/PhysRevMaterials.3.114411.
Khan, Mojammel A., Zhang, Qiang, Bao, Jin-Ke, Fishman, Randy S., Botana, A. S., Choi, Y., Fabbris, G., Haskel, D., Singleton, John, and Mitchell, J. F. Thu . "Steplike metamagnetic transitions in a honeycomb lattice antiferromagnet Tb2Ir3Ga9". United States. doi:10.1103/PhysRevMaterials.3.114411.
@article{osti_1574982,
title = {Steplike metamagnetic transitions in a honeycomb lattice antiferromagnet Tb2Ir3Ga9},
author = {Khan, Mojammel A. and Zhang, Qiang and Bao, Jin-Ke and Fishman, Randy S. and Botana, A. S. and Choi, Y. and Fabbris, G. and Haskel, D. and Singleton, John and Mitchell, J. F.},
abstractNote = {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.},
doi = {10.1103/PhysRevMaterials.3.114411},
journal = {Physical Review Materials},
number = 11,
volume = 3,
place = {United States},
year = {2019},
month = {11}
}

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