TY - JOUR
T1 - Pressure-tuning the quantum spin Hamiltonian of the triangular lattice antiferromagnet Cs2CuCl4
AU - Zvyagin, S. A.
AU - Graf, D.
AU - Sakurai, T.
AU - Kimura, S.
AU - Nojiri, H.
AU - Wosnitza, J.
AU - Ohta, H.
AU - Ono, T.
AU - Tanaka, H.
N1 - Funding Information:
This work was partially supported by Deutsche Forschungsgemeinschaft through the projects ZV6/2-2, SFB 1143, and the Würzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter - ct.qmat (EXC 2147, project-id39085490). We acknowledge support by the HLD at HZDR, member of the European Magnetic Field Laboratory (EMFL). A portion of this work was performed at the National High Magnetic Field Laboratory, which is supported by the National Science Foundation Cooperative Agreement No. DMR-1644779 and the State of Florida. ESR experiments were performed at the High Field Laboratory for Superconducting Materials, Institute for Material Research, Tohoku University (proposals 18H0059 and 17H0071). H.N. acknowledges the support of the KAKENHI 16H04005 Program. S.A.Z. acknowledges the support of the ICC-IMR Visitor Program at Tohoku University. The authors would like to thank O.A. Starykh, R. Valentí, C.D. Batista, L. Balents, and R. Coldea for fruitful discussions, and A. Ponomaryov for the help orienting the samples.
Publisher Copyright:
© 2019, The Author(s).
PY - 2019/12/1
Y1 - 2019/12/1
N2 - 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.
AB - 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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U2 - 10.1038/s41467-019-09071-7
DO - 10.1038/s41467-019-09071-7
M3 - Article
C2 - 30842420
AN - SCOPUS:85062603841
VL - 10
JO - Nature Communications
JF - Nature Communications
SN - 2041-1723
IS - 1
M1 - 1064
ER -