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Type: Artigo de periódico
Title: Hyperhoneycomb Iridate β-li2iro3 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.
Rights: aberto
Identifier DOI: 10.1103/PhysRevLett.114.077202
Date Issue: 2015
Appears in Collections:Unicamp - Artigos e Outros Documentos

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