高温铜酸盐中电子-声子耦合的同位素指纹图谱。

Isotopic fingerprint of electron-phonon coupling in high-Tc cuprates.

作者信息

Iwasawa H, Douglas J F, Sato K, Masui T, Yoshida Y, Sun Z, Eisaki H, Bando H, Ino A, Arita M, Shimada K, Namatame H, Taniguchi M, Tajima S, Uchida S, Saitoh T, Dessau D S, Aiura Y

机构信息

Department of Applied Physics, Tokyo University of Science, Shinjuku-ku, Tokyo 162-8601, Japan.

出版信息

Phys Rev Lett. 2008 Oct 10;101(15):157005. doi: 10.1103/PhysRevLett.101.157005. Epub 2008 Oct 9.

DOI:10.1103/PhysRevLett.101.157005

PMID:18999630

Abstract

Angle-resolved photoemission spectroscopy with low-energy tunable photons along the nodal direction of oxygen isotope substituted Bi(2)Sr(2)CaCu(2)O(8+delta) reveals a distinct oxygen isotope shift near the electron-boson coupling "kink" in the electronic dispersion. The magnitude (a few meV) and direction of the kink shift are as expected due to the measured isotopic shift of phonon frequency, and are also in agreement with theoretical expectations. This demonstrates the participation of the phonons as dominant players, as well as pinpointing the most relevant of the phonon branches.

摘要

沿着氧同位素取代的Bi(2)Sr(2)CaCu(2)O(8+δ)的节点方向，利用低能可调谐光子进行角分辨光电子能谱研究，发现在电子色散中的电子-声子耦合“扭结”附近存在明显的氧同位素位移。扭结位移的大小（几毫电子伏特）和方向与声子频率的测量同位素位移预期一致，也与理论预期相符。这证明了声子作为主要参与者的作用，同时也确定了最相关的声子分支。