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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Pressure tuning of bond-directional exchange interactions and magnetic frustration in the hyperhoneycomb iridate beta-Li2IrO3

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Author(s):
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Veiga, L. S. I. [1, 2, 3, 4] ; Etter, M. [2] ; Glazyrin, K. [2] ; Sun, F. [1, 5, 6, 7] ; Escanhoela, C. A. Jr [1, 8] ; Fabbris, G. [1, 9, 10] ; Mardegan, J. R. L. [2] ; Malavi, P. S. [9] ; Deng, Y. [9] ; Stavropoulos, P. P. [11, 12] ; Kee, H. -Y. [11, 12, 13] ; Yang, W. G. [14] ; van Veenendaal, M. [1, 15] ; Schilling, J. [9] ; Takayama, T. [16, 17, 18] ; Takagi, H. [16, 17, 18] ; Haskel, D. [1]
Total Authors: 17
Affiliation:
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[1] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 - USA
[2] DESY, D-22607 Hamburg - Germany
[3] UCL, Dept Phys & Astron, Gower St, London WC1E 6BT - England
[4] UCL, London Ctr Nanotechnol, Gower St, London WC1E 6BT - England
[5] Ctr High Pressure Sci & Technol Adv Res HPSTAR, Shanghai 201203 - Peoples R China
[6] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190 - Peoples R China
[7] Chinese Acad Sci, Inst Phys, Beijing 100190 - Peoples R China
[8] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Synchrotron Light Lab LNLS, BR-13083970 Campinas, SP - Brazil
[9] Washington Univ, Dept Phys, St Louis, MO 63130 - USA
[10] Brookhaven Natl Lab, Dept Condensed Matter Phys & Mat Sci, Upton, NY 11973 - USA
[11] Univ Toronto, Dept Phys, 60 St George St, Toronto, ON M5S 1A7 - Canada
[12] Univ Toronto, Ctr Quantum Mat, 60 St George St, Toronto, ON M5S 1A7 - Canada
[13] Canadian Inst Adv Res, Quantum Mat Program, Toronto, ON M5G IZ8 - Canada
[14] Carnegie Inst Sci, High Pressure Synerget Consortium HPSynC, Geophys Lab, Argonne, IL 60439 - USA
[15] Northern Illinois Univ, Dept Phys, De Kalb, IL 60115 - USA
[16] Max Planck Inst Solid State Res, Heisenbergstr 1, D-70569 Stuttgart - Germany
[17] Univ Tokyo, Dept Phys, 7-3-1 Hongo, Tokyo 1130033 - Japan
[18] Univ Tokyo, Dept Adv Mat, 7-3-1 Hongo, Tokyo 1130033 - Japan
Total Affiliations: 18
Document type: Journal article
Source: Physical Review B; v. 96, n. 14 OCT 10 2017.
Web of Science Citations: 25
Abstract

We explore the response of Ir 5d orbitals to pressure in beta-Li2IrO3, a hyperhoneycomb iridate in proximity to a Kitaev quantum spin-liquid (QSL) ground state. X-ray absorption spectroscopy reveals a reconstruction of the electronic ground state below 2 GPa, the same pressure range where x-ray magnetic circular dichroism shows an apparent collapse of magnetic order. The electronic reconstruction, which manifests a reduction in the effective spin-orbit interaction in 5d orbitals, pushes beta-Li2IrO3 further away from the pure Jeff = 1/2 limit. Although lattice symmetry is preserved across the electronic transition, x-ray diffraction shows a highly anisotropic compression of the hyperhoneycomb lattice which affects the balance of bond-directional Ir-Ir exchange interactions driven by spin-orbit coupling at Ir sites. An enhancement of symmetric anisotropic exchange over Kitaev and Heisenberg exchange interactions seen in theoretical calculations that use precisely this anisotropic Ir-Ir bond compression provides one possible route to the realization of a QSL state in this hyperhoneycomb iridate at high pressures. (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 type: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 16/24137-3 - Orbital magnetism in double perovskite compounds under extreme conditions by synchrotron radiation techniques
Grantee:Carlos Augusto Escanhoela Júnior
Support type: Scholarships abroad - Research Internship - Post-doctor