Angle-resolved photoemission study of the cobalt oxide superconductor Na(x)CoO(2) x yH(2)O: observation of the Fermi surface.
Angle-resolved photoemission study of the cobalt oxide superconductor Na(x)CoO(2) x yH(2)O: observation of the Fermi surface.
复制标题
DOI：
10.1103/physrevlett.97.267003
复制
发表时间：
2006-06
影响因子：
8.6
通讯作者：
T. Shimojima;K. Ishizaka;S. Tsuda;T. Kiss;T. Yokoya;A. Chainani;S. Shin;Petre Badica;Kohta Yamada;Kazumasa Togano
中科院分区：
文献类型：
--
作者：
T. Shimojima;K. Ishizaka;S. Tsuda;T. Kiss;T. Yokoya;A. Chainani;S. Shin;Petre Badica;Kohta Yamada;Kazumasa Togano
The cobalt oxide superconductor Na(x)CoO(2) x yH(2)O is studied by angle-resolved photoemission spectroscopy. We report the Fermi surface (FS) topology and electronic structure near the Fermi level (E(F)) in the normal state of Na(x)CoO(2) x yH(2)O. Our result indicates the presence of the hexagonal FS centered at the Gamma point, while the small pocket FSs along Gamma-K direction are absent, similar to Na(x)CoO(2). The top of the e(g)(') band, which is expected in band calculations to form the small pocket FSs, extends to within approximately 30 meV below E(F), closer to E(F) than in Na(x)CoO(2). We discuss its possible role in superconductivity, comparing with other experimental and theoretical results.
