| Full text | |
| Author(s): Show less - |
Veiga, L. S. I.
;
Etter, M.
;
Glazyrin, K.
;
Sun, F.
;
Escanhoela, C. A. Jr
;
Fabbris, G.
;
Mardegan, J. R. L.
;
Malavi, P. S.
;
Deng, Y.
;
Stavropoulos, P. P.
;
Kee, H. -Y.
;
Yang, W. G.
;
van Veenendaal, M.
;
Schilling, J.
;
Takayama, T.
;
Takagi, H.
;
Haskel, D.
Total Authors: 17
|
| Document type: | Journal article |
| Source: | PHYSICAL REVIEW B; v. 96, n. 14, p. 6-pg., 2017-10-10. |
| 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: | 16/24137-3 - Orbital magnetism in double perovskite compounds under extreme conditions by synchrotron radiation techniques |
| Grantee: | Carlos Augusto Escanhoela Júnior |
| Support Opportunities: | Scholarships abroad - Research Internship - Post-doctor |
| 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 |