Study of the inter-layer and intra-layer interactions in high-Tc superconducting states using low-energy synchrotron radiation

利用低能同步辐射角分辨光电发射的高分辨率和波段选择性，我们直接测定了高tc铜超导体中的精细准粒子结构。我们发现，由于面外杂质引起的弱面内势无序，在d波超导状态下产生了很强的对制动效应，并且抑制了电子系统的筛选，导致电子-声子相互作用和弹性杂质散射的增加，从而增强了准粒子质量。

Exploiting the high resolution and band selectivity of low-energy synchrotron-radiation angle-resolved-photoemission, we have directly determined fine quasiparticle structures in high-Tc cuprate superconductors. We found that weak in-plane potential disorder due to the out-of-plane impurities makes a strong pair-braking effect in d-wave superconducting state, and that it also makes a suppression of the screening by the electronic system, leading to the increase in electron-phonon interaction and elastic impurity scattering, and thus to the enhancement of the quasiparticle mass.