Emergence of a Fluctuating Ground State in Y-Kapellasite under Pressure
Year: 2026
Type: article
Abstract: Y-kapellasite [Y_{3}Cu_{9}(OH)_{19}Cl_{8}], 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)2057-396010.1038/s41524-021-00689-0], 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)PRBMDO2469-995010.1103/PhysRevB.107.125156]. 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.
Source: Physical Review Letters
DOI: 10.1103/3pmg-b78n
Authors: Dipranjan Chatterjee, Petr Doležal, Federico Abbruciati, Tobias Biesner, Katharina M. Zoch, Rustem Khasanov, Shams Sohel Islam, Guratinder Kaur, Seulki Roh, Francesco Capitani, Joao Elias F. S. Rodrigues, Gaston Garbarino, Cornelius Krellner, Philippe Mendels, Edwin Kermarrec, Martin Dressel, Björn Wehinger, Andrej Pustogow, Fabrice Bert, Pascal Puphal
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,750
Funders: Government of the United Kingdom, UK Research and Innovation, Deutsche Forschungsgemeinschaft, Agence Nationale de la Recherche, European Synchrotron Radiation Facility, Grantová Agentura České Republiky, Hochschuljubiläumsstiftung der Stadt Wien, Cambridge Crystallographic Data Centre, HORIZON EUROPE Framework Programme, HORIZON EUROPE Innovative Europe
Awards: G1381536851, Quantum Spin Liquids in Kagome Mateirals, G3180218165, G3338745373, Investigation of magneto-elastic interaction in quantum spin liquid candidate materials, G426566155, G4656594441, Quantum Spin Liquids: Ground states, Impurities and Excitations, G5611707907, G7136846658, G7389200744, TRR 288: Elastisches Tuning und elastische Reaktion elektronischer Quantenphasen der Materie (ELASTOQMAT), G8193087220
OpenAlex ID: W4407632036