Spin liquids are exotic phases of matter that often support emergent gauge fields and quasi-particle excitations. While spin liquids are commonly known for remaining disordered, their definition has been extended to include phases with broken symmetry corresponding to (partial) long-range order, such as chiral and nematic spin liquids for example. For Coulomb spin liquids, this ordering can be quantitatively understood via a Helmholtz decomposition between divergence-free and divergence-full terms. This phenomenon has been coined fragmentation, where spin degrees of freedom fragment into two components: the fluctuating disordered part and the ordered one. In this review, we will cover the theoretical and experimental aspects of this growing field, in particular its relation to magnetic monopoles in spin ice, its phase diagram and the possibility to observe it in solid-state crystal and artificial networks.

中文翻译：

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受挫磁铁中的碎片：回顾

自旋液体是物质的奇异相，通常支持涌现规范场和准粒子激发。虽然自旋液体通常以保持无序着称，但它们的定义已扩展到包括与（部分）长程有序相对应的对称性破缺的相，例如手性和向列自旋液体。对于库仑自旋液体，可以通过无发散项和全发散项之间的亥姆霍兹分解来定量理解这种排序。这种现象被称为分裂，其中自旋自由度分裂为两个部分：波动的无序部分和有序部分。在这篇综述中，我们将介绍这个不断增长的领域的理论和实验方面，特别是它与自旋冰中磁单极子的关系，