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Emergence of a Fluctuating Ground State in Y-Kapellasite under Pressure

Dipranjan Chatterjee1,2,*, Petr Doležal3,4, Federico Abbruciati5, Tobias Biesner6, Katharina M. Zoch7, Rustem Khasanov8, Shams Sohel Islam8, Guratinder Kaur9, Seulki Roh6 et al.

Francesco Capitani10, Joao Elias F. S. Rodrigues5, Gaston Garbarino5, Cornelius Krellner7, Philippe Mendels1, Edwin Kermarrec1, Martin Dressel6, Björn Wehinger5, Andrej Pustogow4, Fabrice Bert1, and Pascal Puphal9,6,†

  • *Contact author: dipranjan.chatterjee@physics.ox.ac.uk
  • †Contact author: P.Puphal@fkf.mpg.de
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Phys. Rev. Lett. 136, 136701 – Published 30 March, 2026

DOI: https://doi.org/10.1103/3pmg-b78n

Abstract

Y-kapellasite [Y3Cu9(OH)19Cl8], which hosts an original anisotropic kagome sublattice, is a promising candidate for studying elusive and complex correlated physics. It exhibits a theoretically predicted in-plane (1/3,1/3) magnetic order [Hering et al., npj Comput. Mater. 8, 1 (2022)], but its magnetic interaction values place it close to a phase boundary to a spin liquid state [Chatterjee et al., Phys. Rev. B 107, 125156 (2023)]. Our μSR measurements under hydrostatic pressure demonstrate the complete suppression of static magnetism in favor of a fully dynamical ground state at 2.3 GPa. Complementary high-pressure x-ray and optical phonon measurements reveal a gradual reduction of the kagome anisotropy, enhancing magnetic frustration without structural transitions. Our results establish Y-kapellasite as a rare clean kagome model in which long-range order is suppressed by pressure-tuned frustration, the first fingerprint for the realization of a quantum spin liquid without strong disorder.

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Phys. Rev. Lett. 136, 136701– Published 30 March, 2026
  • Received 15 September 2025
  • Revised 26 January 2026
  • Accepted 2 March 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Open access publication funded by the Max Planck Society.

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