ARPES on Na0.6CoO2: Fermi surface and unusual band dispersion

作者：Yang HB^*; Wang SC; Sekharan AKP; Matsui H; Souma S; Sato T; Takahashi T; Takeuchi T; Campuzano JC; Jin R; Sales BC; Mandrus D; Wang Z; Ding H

来源：Physical Review Letters, 2004, 92(24): 246403.

DOI：10.1103/PhysRevLett.92.246403

The electronic structure of single crystals Na0.6CoO2, which are closely related to the superconducting Na0.3CoO2.yH(2)O (T(c)similar to5 K), is studied by angle-resolved photoelectron spectroscopy. While the measured Fermi surface (FS) is consistent with the large FS enclosing the Gamma point from the band theory, the predicted small FS pockets near the K points are absent. In addition, the band dispersion is found to be highly renormalized, and anisotropic along the two principal axes (Gamma-K, Gamma-M). Our measurements also indicate that an extended flatband is formed slightly above E-F along Gamma-K.

• 出版日期2004-6-18