Quantum magnetic properties in a geometrically frustrated lattice of spin‐1/2 magnet, such as quantum spin liquid or solid and the associated spin fractionalization, are considered key in developing a new phase of matter. The feasibility of observing the quantum magnetic properties, usually found in geometrically frustrated lattice of spin‐1/2 magnet, in a perovskite material with controlled disorder is demonstrated. It is found that the controlled chemical disorder, due to the chemical substitution of Ru ions by Co‐ions, in a simple perovskite CaRuO₃ creates a random prototype configuration of artificial spin‐1/2 that forms dimer pairs between the nearest and further away ions. The localization of the Co impurity in the Ru matrix is analyzed using the Anderson localization formulation. The dimers of artificial spin‐1/2, due to the localization of Co impurities, exhibit singlet‐to‐triplet excitation at low temperature without any ordered spin correlation. The localized gapped excitation evolves into a gapless quasi‐continuum as dimer pairs break and create freely fluctuating fractionalized spins at high temperature. Together, these properties hint at a new quantum magnetic state with strong resemblance to the resonance valence bond system.

中文翻译：

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钙钛矿中安德森局部人工自旋1/2的量子磁性

自旋1/2磁体在几何上受挫的晶格中的量子磁性，例如量子自旋液体或固体，以及相关的自旋分级，被认为是物质发展新阶段的关键。证明了在具有受控无序的钙钛矿材料中观察通常在自旋1/2磁体的几何受挫晶格中发现的量子磁性的可行性。发现在简单的钙钛矿CaRuO _3中，由于Ru离子被Co离子化学取代，可控的化学紊乱创建一个人工自旋1/2的随机原型结构，该结构在最近的离子和距离更远的离子之间形成二聚体对。使用安德森（Anderson）定位公式分析了Ru基质中Co杂质的定位。由于Co杂质的局限性，人工自旋1/2的二聚体在低温下表现出从单重态到三重态的激发，没有任何有序的自旋相关性。当二聚体对断裂并在高温下产生自由波动的分数自旋时，局部有间隙的激发会演变成无间隙的准连续峰。这些特性共同暗示了一种新的量子磁性态，与共振价键体系非常相似。