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Electron-Phonon Interaction in the High-TCCuprates in the Framework of the Van Hove Scenario

机译:Van Hove情景框架中高TC速率电子中的电子-声子相互作用

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Electron-lattice interaction was the original idea of Müller and Berdnorz who chose copper oxides, because of the strong Jahn-Teller effect of the Cu ion leading to the formation of bipolarons. Later several experimental features led to theoretical models based on strong electronic correlations. The high-TCsuperconductors cuprates are quasi-bidimensional (2D) and thus lead to the existence of Van Hove singularities (VHs) in the band structure, that is, a peak in the electronic density of states. The presence of VHs near the Fermi-level in the cuprates is now well established. In this context we show that many physical properties of these materials can be explained using electron-phonon interaction, in particular the high critical temperatureTC, the anomalous isotope effect, the superconducting gap and its anisotropy, and the marginal Fermi-liquid properties. These compounds present a topological transition for a critical hole dopingp≈0.21hole perCuO2plane.
机译:电子-晶格相互作用是Müller和Berdnorz最初选择氧化铜的想法,因为Cu离子具有很强的Jahn-Teller效应,导致了双极化子的形成。后来的一些实验特征导致了基于强电子相关性的理论模型。高TC超导体的铜酸盐是准二维(2D),因此导致能带结构中存在Van Hove奇异点(VHs),即状态电子密度的峰值。铜酸盐中的费氏水平附近的VH的存在已得到充分证实。在这种情况下,我们表明可以使用电子-声子相互作用来解释这些材料的许多物理性质,特别是高临界温度TC,异常同位素效应,超导间隙及其各向异性以及边缘费米液体性质。这些化合物对每CuO2平面的临界空穴掺杂p≈0.21hole呈现拓扑转变。

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