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首页> 外文期刊>Physical review >Low-frequency chain and in-plane optical conductivities of detwinned YBa_2Cu_3O_y: Slave-boson mean-field analysis of the t-J model
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Low-frequency chain and in-plane optical conductivities of detwinned YBa_2Cu_3O_y: Slave-boson mean-field analysis of the t-J model

机译：脱折的YBa_2Cu_3O_y的低频链和面内电导率：t-J模型的从玻色子平均场分析

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摘要

Based on a scenario in which the CuO_2 plane and CuO chain is coupled together, we study theoretically the low-frequency chain and in-plane optical conductivities of detwinned YBa_2Cu_3O_y,. Using the slave-boson mean-field approach to the t-J model and including the antiferromagnetic spin fluctuations in the plane, we elaborate that the chain is superconducting for y > 6.67 while insulating for y < 6.67 due to the competition between the plane-chain coupling and the antiferromagnetic order in the chain, corresponding to a superconductor-insulator transition. Stemming also from the coupling between the plane and chain, a new peak emerges at a low frequency in the in-plane spectra in the superconducting state, while it disappears in the normal state. These results are consistent with very recent experiments.
机译：基于CuO_2平面和CuO链耦合在一起的情况，我们从理论上研究了解缠的YBa_2Cu_3O_y的低频链和平面内电导率。使用从玻色子平均场方法到tJ模型，并包括平面中的反铁磁自旋涨落，我们阐述了由于平面链耦合之间的竞争，链对于y> 6.67是超导的，而对于y <6.67是绝缘的链中的反铁磁顺序，对应于超导体-绝缘体的过渡。同样从平面和链之间的耦合中阻止，在超导状态下的平面内光谱中，一个低频处出现了一个新的峰值，而在正常状态下则消失了。这些结果与最近的实验一致。

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