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首页> 外文期刊>Physical review >Electron-phonon coupling in the undoped cuprate YBa_2Cu_3O_6 estimated from Raman and optical conductivity spectra
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Electron-phonon coupling in the undoped cuprate YBa_2Cu_3O_6 estimated from Raman and optical conductivity spectra

机译:拉曼光谱和电导率光谱估计未掺杂铜酸盐YBa_2Cu_3O_6中的电子-声子耦合

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摘要

We study experimentally the Raman response of the undoped high-T_c parent compound YBa_2Cu_3O_6, and give a unified theory of the two-magnon Raman peak and optical conductivity based on the Hubbard-Holstein model with electron-phonon coupling (EPC). The Hubbard model without EPC can qualitatively account for the experimentally observed resonance of the Raman response, but only the Hubbard-Holstein model (ⅰ) reproduces the asymmetry of the Raman spectrum, (ⅱ) validates the experimental visibility of the two-magnon peak, and (ⅲ) predicts the correct shape and energy of the lower edge of the charge transfer gap in optical conductivity. A comparison of experiments with the theory gives the EPC strength λ = 0.6. This result convincingly indicates the vital role of EPC in high-T_c cuprates, providing a clue to the mechanism of high T_c.
机译:我们通过实验研究了未掺杂的高T_c母体化合物YBa_2Cu_3O_6的拉曼响应,并基于具有电子-声子耦合(EPC)的Hubbard-Holstein模型,给出了两个磁振拉曼峰和光导率的统一理论。没有EPC的Hubbard模型可以定性地解释实验观察到的拉曼响应共振,但是只有Hubbard-Holstein模型(ⅰ)再现了拉曼光谱的不对称性,(ⅱ)验证了两磁子峰的实验可见性, (ⅲ)预测了光导率中电荷转移间隙下边缘的正确形状和能量。将实验与理论进行比较,得出EPC强度λ= 0.6。该结果令人信服地表明了EPC在高T_c铜酸盐中的重要作用,为高T_c的机理提供了线索。

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  • 来源
    《Physical review》 |2018年第12期|121104.1-121104.5|共5页
  • 作者单位

    Scuola Normale Superiore, Piazza dei Cavalieri 7, 1-56126, Pisa, Italy,Istitulo Italiano di Tecnologia Center for Nanotechnology Innovation @NEST, Piazza San Silvestro 12, 1-56127 Pisa, Italy;

    SPIN-CNR and Dipartimento di Scienze Fisiche, University di Napoli Federico Ⅱ, 1-80126 Napoli, Italy;

    RIKEN Center for Emergent Matter Science (CEMS), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan,NRC "Kurchatov Institute," Moscow 123182, Russia;

    RIKEN Center for Emergent Matter Science (CEMS), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan,Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan;

    Department of Physics, University of Colorado-Boulder, Boulder, Colorado 80309, USA;

    Department of Physics, University of Colorado-Boulder, Boulder, Colorado 80309, USA,Center for Experiments on Quantum Materials, University of Colorado-Boulder, Boulder, Colorado 80309, USA;

    Institute for Solid State Physics, Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany;

    SPIN-CNR and Dipartimento di Scienze Fisiche, University di Napoli Federico Ⅱ, 1-80126 Napoli, Italy;

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