Pressure-tuning the quantum spin Hamiltonian of the triangular lattice antiferromagnet CsCuCl
arXiv:1903.04784 · doi:10.1038/s41467-019-09071-7
Abstract
Quantum triangular-lattice antiferromagnets are important prototype systems to investigate phenomena of the geometrical frustration in condensed matter. Apart from highly unusual magnetic properties, they possess a rich phase diagram (ranging from an unfrustrated square lattice to a quantum spin liquid), yet to be confirmed experimentally. One major obstacle in this area of research is the lack of materials with appropriate (ideally tuned) magnetic parameters. Using CsCuCl as a model system, we demonstrate an alternative approach, where, instead of the chemical composition, the spin Hamiltonian is altered by hydrostatic pressure. The approach combines high-pressure electron spin resonance and magnetization measurements, allowing us not only to quasi-continuously tune the exchange parameters, but also to accurately monitor them. Our experiments indicate a substantial increase of the exchange coupling ratio from 0.3 to 0.42 at a pressure of 1.8 GPa, revealing a number of emergent field-induced phases.
References in corpus (8)
- Unusual ordered phases of highly frustrated magnets: a review
- Ground States of Spin-1/2 Triangular Antiferromagnets in a Magnetic Field
- Singlet-triplet dispersion reveals additional frustration in the triangular dimer compound BaMnO
- Phases of triangular lattice antiferromagnet near saturation
- Half-magnetization plateau in a Heisenberg antiferromagnet on a triangular lattice
- Effect of pressure on the quantum spin ladder material IPA-CuCl3
- Dimensional reduction by pressure in the magnetic framework material CuF(DO)pyz: from spin-wave to spinon excitations
- Magnetic phase diagram of the triangular antiferromagnetic mixed system