Photoemission study of the superconducting-gap symmetry in electron-doped high-Tc superconductors

✍ Scribed by H. Matsui; T. Sato; T. Takahashi; K. Nakayama; K. Terashima; M. Fujita; K. Yamada

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 136 KB
• Volume: 460-462
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2007.03.155

✦ Synopsis

To study the superconducting-gap symmetry in electron-doped HTSC, we performed a high-resolution ARPES on Pr 0.89 LaCe 0.11 -CuO 4 (optimally-doped, T c = 26 K). Obtained momentum dependence of the superconducting gap is basically consistent with the d x 2 Ày 2 -wave symmetry, but obviously deviates from the monotonic form of the d x 2 Ày 2 gap function. The maximum superconducting gap is not located at the zone boundary as expected from a simple d x 2 Ày 2 -wave, but observed at the so-called hot spot where the antiferromagnetic spin fluctuation strongly couples to the electrons on the Fermi surface. This ARPES result suggests that the spin-correlation plays an essential role in the pairing mechanism of electron-doped HTSC.