高Tc FeAs超导体中的紧束缚库珀对、准粒子扭结和对势线索
Tightly-bound Cooper pair, quasiparticle kinks and clues on the pairing potential in a high Tc FeAs Superconductor
摘要：
本文对新发现的高温超导体（Sr/Ba）_1-xK_xFe_2As_2进行了系统的光电子能谱研究。通过利用一个独特的光子能量范围和散射几何形状，我们解决了这个系列的中心费米表面上的相互作用的电子的单粒子动力学的细节，显示出整体强耦合行为（2D/kBTc = 6）。准粒子色散扭结观察到的结合能范围为15至50毫电子伏，匹配的磁激发能规模（参数化的J1，J2）。的库珀对波函数的大小被发现是小于20 A，表明短的面内尺度的BCS-声子的情况下，但暗示的相位因子的全球序参量的特征。扭结可能反映了强烈受挫波动自旋激发和软声子约20-40 meV的贡献。我们的结果提供了重要的线索，在这些超导体中实现的对势的性质。
英文摘要：
We present a systematic photoemission study of the newly discovered high Tc superconductor class (Sr/Ba)1-xKxFe2As2. By utilizing a unique photon energy range and scattering geometry we resolve the details of the single particle dynamics of interacting electrons on the central Fermi surfaces of this series which shows overall strong coupling behavior (2D/kBTc = 6). Quasiparticle dispersion kinks are observed in a binding energy range of 15 to 50 meV which matches the magnetic excitation energy scales (parameterized by J1,J2). The size of the Cooper pair wavefunction is found to be less than 20A indicating a short in-plane scale uncharacteristic of a BCS-phonon scenario but suggestive of a phase factor in the global order parameter. The kink likely reflects contributions from the strongly frustrated fluctuating spin excitations and the soft phonons around 20-40 meV. Our results provide important clue to the nature of the pairing potential realized in these superconductors.
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