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THU: Thursday Contributed Sessions

THU 8: Frustrated Quantum Systems: Contributed Session to Symposium

THU 8.5: Talk

Thursday, September 11, 2025, 15:15–15:30, ZHG009

Pressure control of magnetic frustration — •Björn Wehinger — European Synchrotron Radiation Facility, 71, avenue des Martyrs, CS 40220, 38043 Grenoble Cedex 9, France.

Low-dimensional materials with strong magnetic frustration and enhanced quantum fluctuations embody the characteristics of the long-sought spin liquid where magnetic order is suppressed and fractional excitations and entanglement are expected. Significant progress in materials science has been made in realizing copper-based quantum magnets where localized spin-1/2 moments are arranged in low dimensions allowing for geometrical frustration.

In this contribution I will show how external pressure can be used to control magnetic frustration. Using single crystal x-ray diffraction at high-pressure and low temperature together with density functional theory calculations we investigate how pressure-induced modifications in the structure influences the strength of the magnetic exchange [1]. In presence of anisotropy in the system the various super-exchange paths are affected differently by hydrostatic pressure which allows direct control of magnetic frustration [2]. Stabilizing new quantum phases at high pressure opens the possibility to drive systems close to quantum critical points which in-turn enables to investigate the development of spin and lattice correlations as the system approaches criticality.

Finally, I will give a broader overview of research possibilities on quantum materials at the European Synchrotron.

[1] B. Wehinger et al., Phys. Rev. Lett. 121, 117201 (2018).

[2] D. Chatterjee et al., arXiv:2502.09733 (2025).

Keywords: quantum magnets; high pressure; magnetic frustration