Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Hyperhoneycomb Iridate beta-Li2IrO3 as a Platform for Kitaev Magnetism

Full text
Author(s):
Takayama, T. [1, 2, 3] ; Kato, A. [2, 3] ; Dinnebier, R. [1] ; Nuss, J. [1] ; Kono, H. [2, 3] ; Veiga, L. S. I. [4, 5, 6] ; Fabbris, G. [6, 7] ; Haskel, D. [6] ; Takagi, H. [1, 2, 3]
Total Authors: 9
Affiliation:
[1] Max Planck Inst Solid State Res, D-70569 Stuttgart - Germany
[2] Univ Tokyo, Dept Phys, Tokyo 1130033 - Japan
[3] Univ Tokyo, Dept Adv Mat, Tokyo 1130033 - Japan
[4] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil
[5] Lab Nacl Luz Sincrotron, BR-13083970 Campinas, SP - Brazil
[6] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 - USA
[7] Washington Univ, Dept Phys, St Louis, MO 63130 - USA
Total Affiliations: 7
Document type: Journal article
Source: Physical Review Letters; v. 114, n. 7 FEB 19 2015.
Web of Science Citations: 171
Abstract

A complex iridium oxide beta-Li2IrO3 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 mu(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 beta-Li2IrO3 is located in close proximity of a Kitaev spin liquid. (AU)

FAPESP's process: 13/14338-3 - Interplay between superconductivity and magnetism in systems under pressure and thin films
Grantee:Larissa Sayuri Ishibe Veiga
Support Opportunities: Scholarships abroad - Research Internship - Doctorate