Orbital-dependent modifications of electronic structure across the magnetostructural transition in BaFe2As2.
Laser angle-resolved photoemission spectroscopy (ARPES) is employed to investigate the temperature (T) dependence of the electronic structure in BaFe2As2 across the magnetostructural transition at T{N} approximately 140 K. A drastic transformation in Fermi surface (FS) shape across T{N} is observed, as expected by first-principles band calculations. Polarization-dependent ARPES and band calculations consistently indicate that the observed FSs at k{z} approximately pi in the low-T antiferromagnetic state are dominated by the Fe3d{zx} orbital, leading to the twofold electronic structure. These results indicate that magnetostructural transition in BaFe2As2 accompanies orbital-dependent modifications in the electronic structure.
Shimojima
T
T
Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, Chiba 277-8581, Japan. t-shimo@issp.u-tokyo.ac.jp
Ishizaka
K
K
Ishida
Y
Y
Katayama
N
N
Ohgushi
K
K
Kiss
T
T
Okawa
M
M
Togashi
T
T
Wang
X-Y
XY
Chen
C-T
CT
Watanabe
S
S
Kadota
R
R
Oguchi
T
T
Chainani
A
A
Shin
S
S