ISSN:
1077-3118
Quelle:
AIP Digital Archive
Thema:
Physik
Notizen:
Polarization-dependent angle-resolved photoemission experiments in the constant final state mode (absorption measurements) were performed on single crystals of the Bi-based 2212 material using synchrotron radiation in the photon energy range 10–40 eV. Evidence of polarization-dependent transitions due to Bi 5d→6p, Sr 4p→4d, and Ca 3p→3d excitations is observed. The data show that the electronic charge is highly localized to the layers of the crystal structure, thus providing a direct spectroscopic confirmation of the two-dimensional nature of these types of materials. Polarization-sensitive absorption signals at 14–15 eV attributed to Bi 6s→6p transitions show that the density of states (DOS) of the Bi 6pz holes peaks at about 0.7 eV higher energy than the DOS of the Bi 6px,y holes.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1063/1.101889