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Evidence for site-centered stripes from magnetic excitations in cuprate superconductors

机译:铜酸盐超导体中磁激发的定点条纹证据

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摘要

The success of models of coupled two-leg spin ladders in describing the magnetic excitation spectrum of La_(2-x);Ba_xCuO_4 has been widely interpreted as evidence for bond-centered stripes. Here, we determine the magnetic coupling induced by the charge stripes between bond- or site-centered spin stripe modeled by two- or three-leg ladder, respectively. We find that only the site-centered models order. We further report excellent agreement of a fully consistent analysis of coupled three-leg ladders using a spin-wave theory of bond operators with the experiment.
机译:耦合两腿自旋阶梯模型在描述La_(2-x); Ba_xCuO_4的磁激发谱中的成功已被广泛解释为以键为中心的条纹的证据。在这里,我们确定由分别由两腿或三腿阶梯建模的键合或定点自旋条带之间的电荷条带引起的磁耦合。我们发现只有以站点为中心的模型才能订购。我们进一步报告了使用结合算子的自旋波理论对耦合三腿阶梯进行完全一致分析的极好的一致性。

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