TY - JOUR
T1 - Two different types of pseudogaps in high-Tc superconductors
AU - Takahashi, T.
AU - Sato, T.
AU - Yokoya, T.
AU - Kamiyama, T.
AU - Naitoh, Y.
AU - Mochiku, T.
AU - Yamada, K.
AU - Endoh, Y.
AU - Kadowaki, K.
PY - 2001/1
Y1 - 2001/1
N2 - Ultrahigh-resolution (ΔE = 7 meV angle-resolved (ARPES) and angle-integrated (AIPES) photoemission spectroscopy have been performed on optimally doped Bi2Sr2CaCu2O8 (Bi2212) and La1.85Sr0.15CuO4 (LSCO). The ARPES spectrum of Bi2212 at the (π, 0)-(π, π) crossing shows a pseudogap at EF above Tc, which is smoothly connected from the superconducting gap across Tc and closes slightly above Tc (T* = 110 K). On the other hand, the AIPES spectra both in Bi2212 and LSCO show a remarkable depletion of the density of states in a relatively wider energy (100-150 meV) region near EF. The temperature-induced filling of the depletion persists far above Tc and T*. This suggests that there are two different pseudogaps in the high-Tc superconductors; one is likely associated with pairing and the other is attributed to the development of antiferromagnetic correlation.
AB - Ultrahigh-resolution (ΔE = 7 meV angle-resolved (ARPES) and angle-integrated (AIPES) photoemission spectroscopy have been performed on optimally doped Bi2Sr2CaCu2O8 (Bi2212) and La1.85Sr0.15CuO4 (LSCO). The ARPES spectrum of Bi2212 at the (π, 0)-(π, π) crossing shows a pseudogap at EF above Tc, which is smoothly connected from the superconducting gap across Tc and closes slightly above Tc (T* = 110 K). On the other hand, the AIPES spectra both in Bi2212 and LSCO show a remarkable depletion of the density of states in a relatively wider energy (100-150 meV) region near EF. The temperature-induced filling of the depletion persists far above Tc and T*. This suggests that there are two different pseudogaps in the high-Tc superconductors; one is likely associated with pairing and the other is attributed to the development of antiferromagnetic correlation.
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U2 - 10.1016/S0022-3697(00)00098-6
DO - 10.1016/S0022-3697(00)00098-6
M3 - Article
AN - SCOPUS:0034825156
VL - 62
SP - 41
EP - 45
JO - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
SN - 0022-3697
IS - 1-2
ER -