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Title: Hyperhoneycomb Iridate β - Li 2 IrO 3 as a Platform for Kitaev Magnetism

Abstract

A complex iridium oxide β-Li 2IrO 3 crystallizes in a hyperhoneycomb structure, a three-dimensional analogue of honeycomb lattice, and is found to be a spin-orbital Mott insulator with J eff = 1/2 moment. Ir ions are connected to the three neighboring Ir ions via Ir-O 2-Ir bonding planes, which very likely gives rise to bond-dependent ferromagnetic interactions between the J eff = 1/2 moments, an essential ingredient of Kitaev model with a spin liquid ground state. Dominant ferromagnetic interaction between J(eff) = 1/2 moments is indeed confirmed by the temperature dependence of magnetic susceptibility chi(T) which shows a positive Curie-Weiss temperature $$\theta$$(CW) similar to +40 K. A magnetic ordering with a very small entropy change, likely associated with a noncollinear arrangement of J eff = 1/2 moments, is observed at T c = 38 K. With the application of magnetic field to the ordered state, a large moment of more than 0.35 μ B/Ir is induced above 3 T, a substantially polarized J eff = 1/2 state. We argue that the close proximity to ferromagnetism and the presence of large fluctuations evidence that the ground state of hyperhoneycomb β-Li 2IrO 3 is located in close proximity of a Kitaev spin liquid.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1392960
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 114; Journal Issue: 7; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

Citation Formats

Takayama, T., Kato, A., Dinnebier, R., Nuss, J., Kono, H., Veiga, L. S. I., Fabbris, G., Haskel, D., and Takagi, H. Hyperhoneycomb Iridate β-Li2IrO3 as a Platform for Kitaev Magnetism. United States: N. p., 2015. Web. doi:10.1103/PhysRevLett.114.077202.
Takayama, T., Kato, A., Dinnebier, R., Nuss, J., Kono, H., Veiga, L. S. I., Fabbris, G., Haskel, D., & Takagi, H. Hyperhoneycomb Iridate β-Li2IrO3 as a Platform for Kitaev Magnetism. United States. doi:10.1103/PhysRevLett.114.077202.
Takayama, T., Kato, A., Dinnebier, R., Nuss, J., Kono, H., Veiga, L. S. I., Fabbris, G., Haskel, D., and Takagi, H. Sun . "Hyperhoneycomb Iridate β-Li2IrO3 as a Platform for Kitaev Magnetism". United States. doi:10.1103/PhysRevLett.114.077202.
@article{osti_1392960,
title = {Hyperhoneycomb Iridate β-Li2IrO3 as a Platform for Kitaev Magnetism},
author = {Takayama, T. and Kato, A. and Dinnebier, R. and Nuss, J. and Kono, H. and Veiga, L. S. I. and Fabbris, G. and Haskel, D. and Takagi, H.},
abstractNote = {A complex iridium oxide β-Li2IrO3 crystallizes in a hyperhoneycomb structure, a three-dimensional analogue of honeycomb lattice, and is found to be a spin-orbital Mott insulator with Jeff = 1/2 moment. Ir ions are connected to the three neighboring Ir ions via Ir-O2-Ir bonding planes, which very likely gives rise to bond-dependent ferromagnetic interactions between the Jeff = 1/2 moments, an essential ingredient of Kitaev model with a spin liquid ground state. Dominant ferromagnetic interaction between J(eff) = 1/2 moments is indeed confirmed by the temperature dependence of magnetic susceptibility chi(T) which shows a positive Curie-Weiss temperature $\theta$(CW) similar to +40 K. A magnetic ordering with a very small entropy change, likely associated with a noncollinear arrangement of Jeff = 1/2 moments, is observed at Tc = 38 K. With the application of magnetic field to the ordered state, a large moment of more than 0.35 μB/Ir is induced above 3 T, a substantially polarized Jeff = 1/2 state. We argue that the close proximity to ferromagnetism and the presence of large fluctuations evidence that the ground state of hyperhoneycomb β-Li2IrO3 is located in close proximity of a Kitaev spin liquid.},
doi = {10.1103/PhysRevLett.114.077202},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 7,
volume = 114,
place = {United States},
year = {2015},
month = {2}
}

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