Gonzalez Matías G, Noculak Vincent, Sharma Aman, Favre Virgile, Soh Jian-Rui, Magrez Arnaud, Bewley Robert, Jeschke Harald O, Reuther Johannes, Rønnow Henrik M, Iqbal Yasir, Živković Ivica
Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109, Berlin, Germany.
Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, 14195, Berlin, Germany.
Nat Commun. 2024 Aug 21;15(1):7191. doi: 10.1038/s41467-024-51362-1.
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, KNi(SO), 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 KNi(SO), revealing a high level of agreement between experiment and theory. We further reveal the origin of the dynamical state in KNi(SO) to be centred around a magnetic network composed of tetrahedra on a trillium lattice.
量子自旋液体（QSLs）因其显著的特性，如长程纠缠、分数激发和拓扑保护现象，已成为磁学研究的一个关键领域。最近，尽管由于高维性抑制了量子涨落，但对QSLs的探索已扩展到三维世界。一种新的候选材料KNi(SO)，属于钾镁矾族，由两个相互连接的延龄草晶格组成。尽管它是磁有序的，但呈现出一种高度动态和相关的状态。在这项工作中，我们将非弹性中子散射测量与密度泛函理论（DFT）、赝费米子泛函重整化群（PFFRG）和经典蒙特卡罗（cMC）计算相结合，以研究KNi(SO)的磁性，结果表明实验与理论之间高度吻合。我们进一步揭示了KNi(SO)中动态状态的起源集中在由延龄草晶格上的四面体组成的磁网络周围。
