ARPES on Na_0.6CoO₂: Fermi Surface and Unusual Band Dispersion

Journal Article · Thu Jan 01 00:00:00 EST 2004 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.92.246403· OSTI ID:1003428

Yang, H. B. ^[1]; Wang, S. -C. ^[1]; Sekharan, A. K. P. ^[1]; Matsui, H. ^[2]; Souma, S. ^[2]; Sato, T. ^[2]; Takahashi, T. ^[2]; Takeuchi, T. ^[3]; Campuzano, J. C. ^[4]; Jin, Rongying ^[5]; Sales, Brian C ^[5]; Mandrus, David ^[5]; Wang, Z. ^[1]; Ding, H. ^[1]

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1. Boston College, Chestnut Hill
2. Tohoku University, Japan
3. Nagoya University, Japan
4. University of Illinois, Chicago
5. ORNL

The electronic structure of single crystals Na{sub 0.6}CoO{sub 2}, which are closely related to the superconducting Na{sub 0.3}CoO{sub 2} {center_dot} yH{sub 2}O (T{sub c}-5 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 EF along {Gamma}-K.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1003428
• Journal Information: Physical Review Letters, Vol. 92, Issue 24; ISSN 0031--9007
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BAND THEORY
ELECTRONIC STRUCTURE
FERMI LEVEL
MONOCRYSTALS
PHOTOELECTRON SPECTROSCOPY