Pressure-tuning the quantum spin Hamiltonian of the triangular lattice antiferromagnet Cs2CuCl4

被引：0

作者：

S. A. Zvyagin

D. Graf

T. Sakurai

S. Kimura

H. Nojiri

J. Wosnitza

H. Ohta

T. Ono

H. Tanaka

机构：

[1] Helmholtz-Zentrum Dresden-Rossendorf,Dresden High Magnetic Field Laboratory (HLD

[2] Florida State University,EMFL)

[3] Kobe University,National High Magnetic Field Laboratory

[4] Tohoku University,Research Facility Center for Science and Technology

[5] TU Dresden,Institute for Materials Research

[6] Kobe University,Institut für Festkörper

[7] Osaka Prefecture University, und Materialphysik

[8] Tokyo Institute of Technology,Molecular Photoscience Research Center

来源：

Nature Communications | / 10卷

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摘要：

Quantum triangular-lattice antiferromagnets are important prototype systems to investigate numerous 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 Cs2CuCl4 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 r.f. susceptibility 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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