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首页> 外文OA文献 >Strength of the phonon-coupling mode in $La_{2-x}Sr_{x}CuO_{4}$, $Bi_{2}Sr_{2}CaCu_{2}O_{8+x}$ and $YBa_{2}Cu_{3}O_{6+x}$: An estimation from the ARPES-nodal measurements
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Strength of the phonon-coupling mode in $La_{2-x}Sr_{x}CuO_{4}$, $Bi_{2}Sr_{2}CaCu_{2}O_{8+x}$ and $YBa_{2}Cu_{3}O_{6+x}$: An estimation from the ARPES-nodal measurements

机译：$ La_ {2-x} sr_ {x} CuO_ {4} $中的声子耦合模式的强度，   $ Bi_ {2} sr_ {2} CaCu_ {2} O_ {8 + x} $和$ YBa_ {2} Cu_ {3} O_ {6 + x} $：来自的估计   aRpEs节点测量

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摘要

Despite the intensive efforts for determining the mechanism that causeshigh-temperature superconductivity in copper oxide materials, no consensus onthe pairing mechanism has been reached. Recent advances in high resolutionangle-resolved photoemission spectroscopies have suggested that a sizeableelectron-phonon coupling exists as the principal cause for kinks in thedispersion relations (energy versus wave vector) of the electronic states.Here, we report on a systematic study about the influence of theelectron-phonon coupling parameter "$\lambda$" in the electronic quasiparticledispersions along the nodal direction for $La_{2-x}Sr_{x}CuO_{4}$,$Bi_{2}Sr_{2}CaCu_{2}O_{8+x}$ and $YBa_{2}Cu_{3}O_{6+x}$. Information about thedressing of the charge carriers, i.e., on the enhancement of the effective massand the strength of the coupling mode, is obtained as a function of the dopingconcentration, temperature, momentum and energy from the kink dispersion in the(0-0)-$(\pi,\pi)$ direction of momentum-space avoiding the complications of the\textit{d-}wave superconducting gap. Our analysis shows a remarkable agreementbetween theory and experiment for different samples and at different dopinglevels. This includes our recently introduced theoretical model to adjust theexperimental data of the fermionic band dispersion, emphasising the necessarydistinction between the general electron mass-enhancement parameter$\lambda^{*}$ and the conventional electron-phonon coupling parameter$\lambda$.
机译：尽管为确定引起氧化铜材料高温超导的机理付出了巨大的努力，但在配对机理上尚未达成共识。高分辨率角分辨光发射光谱学的最新进展表明，存在较大的电子-声子耦合是电子态的色散关系（能量与波矢）扭结的主要原因。 $ La_ {2-x} Sr_ {x} CuO_ {4} $，$ Bi_ {2} Sr_ {2} CaCu_ {2}的沿节点方向的电子准粒子分散中的电子-声子耦合参数“ $ \ lambda $” O_ {8 + x} $和$ YBa_ {2} Cu_ {3} O_ {6 + x} $。根据（0-0）-中扭结色散的掺杂浓度，温度，动量和能量，获得了有关电荷载流子制备的信息，即有关有效质量的增强和耦合模式强度的信息。动量空间的$（\ pi，\ pi）$方向避免了\ textit {d-}波超导间隙的复杂性。我们的分析表明，理论和实验之间对于不同的样品和不同的掺杂水平有着显着的一致性。这包括我们最近引入的理论模型，用于调整铁氧体能带色散的实验数据，强调了一般电子质量增强参数$ \ lambda ^ {*} $与常规电子-声子耦合参数$ \ lambda $之间的必要区别。

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    Ruiz, H. S.; Badía-Majós, A.;

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  • 年度 2011
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