X-ray diffraction and spectroscopy studies under high pressure to clarify possible quantum spin-liquid states in Na3Co2SbO6

Date

Apr 14, 2025

Time

2:50 PM - 4:20 PM

Speaker

Steven Gebel

Affiliation

IFMP, TU Dresden

Series

TUD Physik-IFMP Institutsseminar

Language

en

Main Topic

Physik

Other Topics

Physik

Host

D. Peets

Description

Abstract

Honeycomb cobaltates with Co2+ (3d7) ions have been proposed as materials which can host Kitaev quantum spin-liquid (QSL) states. Specifically, Na3Co2SbO6 has been predicted to exhibit a Kitaev QSL upon reduction of the trigonal ligand- and crystal-field splitting, which in turn might be possible via the elastic tuning of the lattice structure [1,2]. This compound hosts edge-sharing CoO6 octahedra and exhibits antiferromagnetic zig-zag ordering below 8 K [3]. In this talk, I present a combination of x-ray diffraction (XRD) and spectroscopy (NIXS) in diamond anvil cells to explore the effect of hydrostatic pressure on the lattice and electronic structure of Na3Co2SbO6. While XRD reveals the pressure dependence of the lattice structure, the high-pressure Co L edge dependence is probed by NIXS, yielding information about the pressure dependent configuration of the Co 3d shell. I present crystal structure data up to 17 GPa of the C2/m monoclinic structure. The NIXS results show significant changes of the Co L-edge line shape for hydrostatic pressures up to 5 GPa. This sets the basis for upcoming theoretical modeling with multiplet and density-functional calculations. 

[1] Liu, Huimei, et al., Phys. Rev. Lett. 15, 047201 (2020).
[2] Liu, Huimei, et al., Phys. Rev. B 97, 014407 (2018).
[3] Yan, J.-Q., et al., Phys. Rev. Mater. 3, 074405 (2019).

Zoom: 688 4227 2214 (https://tu-dresden.zoom-x.de/j/68842272214?pwd=2nPGt3aESuZVlyhMAyv96TZRxkU9F9.1), Passcode: IFMP2024-5

Links

• Webseite
• Termindetails auf den Webseiten der TU Dresden (https://tu-dresden.de)

Last modified: Apr 14, 2025, 7:38:35 AM