Dynamics of K2Ni2(SO4)3 governed by proximity to a 3D spin liquid model

Matías G. Gonzalez, Vincent Noculak, Aman Sharma, Virgile Favre, Jian-Rui Soh, Arnaud Magrez, Robert Bewley, Harald O. Jeschke, Johannes Reuther, Henrik M. Rønnow, Yasir Iqbal and Ivica Živković ()
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Matías G. Gonzalez: Helmholtz-Zentrum Berlin für Materialien und Energie
Vincent Noculak: Helmholtz-Zentrum Berlin für Materialien und Energie
Aman Sharma: Institute of Physics, École Polytechnique Fédérale de Lausanne
Virgile Favre: Institute of Physics, École Polytechnique Fédérale de Lausanne
Jian-Rui Soh: Institute of Physics, École Polytechnique Fédérale de Lausanne
Arnaud Magrez: École Polytechnique Fédérale de Lausanne
Robert Bewley: Harwell Science and Innovation Campus
Harald O. Jeschke: Okayama University
Johannes Reuther: Helmholtz-Zentrum Berlin für Materialien und Energie
Henrik M. Rønnow: Institute of Physics, École Polytechnique Fédérale de Lausanne
Yasir Iqbal: Indian Institute of Technology Madras
Ivica Živković: Institute of Physics, École Polytechnique Fédérale de Lausanne

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Quantum spin liquids (QSLs) have become a key area of research in magnetism due to their remarkable properties, such as long-range entanglement, fractional excitations, and topologically protected phenomena. Recently, the search for QSLs has expanded into the three-dimensional world, despite the suppression of quantum fluctuations due to high dimensionality. A new candidate material, K2Ni2(SO4)3, belongs to the langbeinite family and consists of two interconnected trillium lattices. Although magnetically ordered, it exhibits a highly dynamical and correlated state. In this work, we combine inelastic neutron scattering measurements with density functional theory (DFT), pseudo-fermion functional renormalization group (PFFRG), and classical Monte Carlo (cMC) calculations to study the magnetic properties of K2Ni2(SO4)3, revealing a high level of agreement between experiment and theory. We further reveal the origin of the dynamical state in K2Ni2(SO4)3 to be centred around a magnetic network composed of tetrahedra on a trillium lattice.

Date: 2024
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DOI: 10.1038/s41467-024-51362-1

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