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.
N1 - Funding Information:
This work was supported by grants from the CREST (Core Research for Evolutional Science and Technology Corporation) of JST, the Japan Society for Promotion of Science (JSPS), and the Ministry of Education, Science and Culture of Japan. TS thanks the JSPS for financial support.
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 -