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Type: Artigo de periódico
Title: Hyperhoneycomb Iridate β-li_{2}iro_{3} As A Platform For Kitaev Magnetism.
Author: Takayama, T
Kato, A
Dinnebier, R
Nuss, J
Kono, H
Veiga, L S I
Fabbris, G
Haskel, D
Takagi, H
Abstract: A complex iridium oxide β-Li_{2}IrO_{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 χ(T) which shows a positive Curie-Weiss temperature θ_{CW}∼+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_{2}IrO_{3} is located in close proximity of a Kitaev spin liquid.
Citation: Physical Review Letters. v. 114, n. 7, p. 77202, 2015-Feb.
Rights: aberto
Date Issue: 2015
Appears in Collections:Unicamp - Artigos e Outros Documentos

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