Three-dimensional electronic structure in highly doped NaxCoO2 studied by angle-resolved photoemission spectroscopy期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Three-dimensional electronic structure in highly doped Na_xCoO₂ studied by angle-resolved photoemission spectroscopy

Authors:	Toshiyuki Arakane Takafumi Sato Takenori Fujii

Affiliation:	^a Department of Physics, Tohoku University, Sendai 980-8578, Japan ^b WPI Research Center, Advanced Institute for Material Research, Tohoku University, Sendai 980-8577, Japan ^c Cryogenic Center, University of Tokyo, Tokyo 113-0032, Japan

Abstract:	We have investigated three-dimensional electronic structure for Na_xCoO₂ (x=0.77 and 0.65) by high-resolution angle-resolved photoemission spectroscopy to study the origin of antiferromagnetic (AF) transition of highly doped Na_xCoO₂(x>0.75). The a_1g large hole-like Fermi surface (FS) in x=0.77 shows distinct three-dimensionality along the k_z direction, and a three-dimensional small electron pocket appears around Γ point, indicating strong inter-layer electronic correlation. On the other hand, x=0.65 sample does not show three-dimensional behavior. This result indicates that transition of FS as a function of band filling is closely related to the occurrence of the magnetic transition in highly doped Na_xCoO₂.

Keywords:	C. Photoelectron spectroscopy D. Fermi surface D. Spin-density waves
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