Pressure-tuning the quantum spin Hamiltonian of the triangular lattice antiferromagnet Cs${}_2$CuCl${}_4$

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 Cs${}_2$CuCl${}_4$ 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.

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Cited by in corpus (14)

• Doped Mott Insulators in the Triangular Lattice Hubbard Model
• Finite-temperature properties of the Kitaev-Heisenberg models on kagome and triangular lattices studied by improved finite-temperature Lanczos methods
• Continuous control of classical-quantum crossover by external high pressure in the coupled chain compound CsCuCl${}_3$
• Persistent spin dynamics in the pressurized spin-liquid candidate YbMgGaO${}_4$
• Frustrated Quantum Magnetism with Bose Gases in Triangular Optical Lattices at Negative Absolute Temperatures
• Element-specific field-induced spin reorientation and an unusual tetracritical point in MnCr2S4
• Effects of uniaxial pressure on the spin ice Ho2Ti2O7
• Control of superexchange interactions with DC electric fields
• Magnetic-field and pressure phase diagram of the triangular lattice antiferromagnet CsCuCl${}_3$ clarified by magnetic susceptibility measured with a proximity detector oscillator
• First ESR Detection of Higgs Amplitude Mode and Analysis with Extended Spin-Wave Theory in Dimer System KCuCl${}_3$
• Evidence of one-dimensional magnetic heat transport in the triangular-lattice antiferromagnet Cs${}_2$CuCl${}_4$
• NiCrAl piston-cylinder cell for magnetic susceptibility measurements under high pressures in pulsed high magnetic fields
• Pressure-tuned quantum criticality in the large-$D$ antiferromagnet DTN
• Itinerant magnetism in the triangular lattice Hubbard model at half-doping: Application to twisted transition-metal dichalcogenides