Electronic band structure and Fermi surface of CaB6 studied by angle-resolved photoemission spectroscopy.
We report high-resolution angle-resolved photoemission spectroscopy (ARPES) on CaB6. The band structure determined by ARPES shows a 1 eV energy gap at the X point between the valence and the conduction bands. We found a small electron pocket at the X point, whose carrier number is estimated to be (4-5) x 10(19) cm(-3), in good agreement with the Hall resistivity measurement with the same crystal. The experimental results are discussed in comparison with band structure calculations and theoretical models for the high-temperature ferromagnetism.
Souma
S
S
Department of Physics, Tohoku University, Sendai 980-8578, Japan.
Komatsu
H
H
Takahashi
T
T
Kaji
R
R
Sasaki
T
T
Yokoo
Y
Y
Akimitsu
J
J