Dresden 2026 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 72: Correlated Magnetism – Spin Liquids I

TT 72.8: Vortrag

Donnerstag, 12. März 2026, 11:30–11:45, HSZ/0105

High pressure phase transition of quantum spin liquid candidate Na₂Co₂TeO₆ observed using Raman spectroscopy — •Ihsan Ahmed Kolasseri¹, Subhadip Das^1,2, and Yong P. Chen¹ — ¹Aarhus University, Aarhus, Denmark — ²University of Copenhagen, Copenhagen, Denmark

Quantum spin liquids (QSL) are materials that have possible data storage applications in quantum computing. Conflicting neighbor electron spin interactions of antiferromagnetically coupled magnetic atoms on triangle-based geometries can lead to QSL phase. Two structural phases of NCTO have been reported: the hexagonal P6₃22 phase and the monoclinic C2/m phase. The hexagonal phase of NCTO has an antiferromagnetic ordering at 27 K. An in-plane magnetic field of 7T can suppress the QSL state because of the material’s structure. Understanding and discovering different structural phases of these classes of materials is crucial to learn about QSL states. In this study we applied pressures upto 20 GPa on hexagonal NCTO single crystal and observed significant changes in the Raman peak profile. We have classified the pressure evolution into four pressure regions were the Raman peak profiles change drastically. High pressure single crystal X-ray diffraction and high pressure polarization dependent Raman study could be conducted to confirm this conclusion. Those data are currently under analysis, but will be briefly mentioned.

Keywords: High pressure; Raman spectroscopy; Quantum spin liquids; NCTO