Anisotropic electric conductivity of delafossite PdCoO2 studied by angle-resolved photoemission spectroscopy.
An explicit connection between the electronic structure and the anisotropic high conductivity of delafossite-type PdCoO2 has been established by angle-resolved photoemission spectroscopy (ARPES) and core-level x-ray photoemission spectroscopy. The ARPES spectra show that a large hexagonal electronlike Fermi surface (FS) consists of very dispersive Pd 4d states. The carrier velocity and lifetime are determined from the ARPES data, and the conductivity is calculated by a solution of the Boltzmann equation, which demonstrates that the high anisotropic conductivity originates from the high carrier velocity, the large two-dimensional FS, and the long lifetime of the carriers.
Noh
Han-Jin
HJ
Department of Physics, Chonnam National University, Gwangju 500-757, Korea. ffnhj@chonnam.ac.kr
Jeong
Jinwon
J
Jeong
Jinhwan
J
Cho
En-Jin
EJ
Kim
Sung Baek
SB
Kim
Kyoo
K
Min
B I
BI
Kim
Hyeong-Do
HD