Veiga, LSI;
Etter, M;
Glazyrin, K;
Sun, F;
Escanhoela, CAJ;
Fabbris, G;
Mardegan, JRL;
... Haskel, D; + view all
(2017)
Pressure tuning of bond-directional exchange interactions and magnetic frustration in the hyperhoneycomb iridate β−Li₂IrO₃.
Physical Review B
, 96
(14)
, Article 140402(R). 10.1103/PhysRevB.96.140402.
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Abstract
We explore the response of Ir 5 d orbitals to pressure in β − Li 2 IrO 3 , 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 5 d orbitals, pushes β − Li 2 IrO 3 further away from the pure J eff = 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.
| Type: | Article |
|---|---|
| Title: | Pressure tuning of bond-directional exchange interactions and magnetic frustration in the hyperhoneycomb iridate β−Li₂IrO₃ |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevB.96.140402 |
| Publisher version: | https://doi.org/10.1103/PhysRevB.96.140402 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10075798 |
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