Pseudogap of optimally doped La1.85Sr0.15CuO4 observed by ultrahigh-resolution photoemission spectroscopy

被引：81

作者：

Sato, T ^{[1
]}

Yokoya, T

Naitoh, Y

Takahashi, T

Yamada, K

Endoh, E

机构：

[1] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan

[2] Kyoto Univ, Inst Chem Res, Uji 6110011, Japan

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 83卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.83.2254

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have performed an ultrahigh-resolution (Delta E similar to 7 meV) photoemission spectroscopy on La1.85Sr0.15CuO4 (T-c = 38 K) at 16-250 K. We found a pseudogap at E-F With the size of 30-35 meV, which is gradually filled in by a transfer of states from the higher energy region with increasing temperature, but persists over 200 K. The gap energy is consistent with the characteristic temperatures of the magnetic susceptibility and the Hall coefficient. The temperature evolution is well scaled with that of the Hall coefficient. The pseudogap is not smoothly connected to the superconducting gap (Delta similar to 8 meV below T-c, suggesting a different origin from that in Bi2Sr2CaCu2O8.

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页码：2254 / 2257

页数：4

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