TY - JOUR
T1 - Photoemission study of electronic states in with various doping levels
AU - Uchiyama, H.
AU - Hu, W.
AU - Yamamoto, A.
AU - Tajima, S.
AU - Saiki, K.
AU - Koma, A.
PY - 2000
Y1 - 2000
N2 - The temperature and doping dependences of photoemission spectra of polycrystalline (Formula presented) samples are investigated for several doping levels near the optimum (Formula presented) As doping increases, we observed a systematic shift of the core levels and an increase in the density of states at the Fermi level (Formula presented) Nonlinear shifts of the core levels with doping and a remarkable doping-dependent suppression of the spectral intensity over more than 300 meV below (Formula presented) are compatible with the reported results for (Formula presented) With decreasing temperature, the density of states was gradually suppressed at energies lower than 30 meV, suggesting a gap opening. The estimated leading edge shift is about 10 meV for all samples at both 20 and 105 K.
AB - The temperature and doping dependences of photoemission spectra of polycrystalline (Formula presented) samples are investigated for several doping levels near the optimum (Formula presented) As doping increases, we observed a systematic shift of the core levels and an increase in the density of states at the Fermi level (Formula presented) Nonlinear shifts of the core levels with doping and a remarkable doping-dependent suppression of the spectral intensity over more than 300 meV below (Formula presented) are compatible with the reported results for (Formula presented) With decreasing temperature, the density of states was gradually suppressed at energies lower than 30 meV, suggesting a gap opening. The estimated leading edge shift is about 10 meV for all samples at both 20 and 105 K.
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U2 - 10.1103/PhysRevB.62.615
DO - 10.1103/PhysRevB.62.615
M3 - Article
AN - SCOPUS:0000446645
VL - 62
SP - 615
EP - 621
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 0163-1829
IS - 1
ER -