凝聚态物理
角分辨光电子能谱
超导电性
物理
假间隙
范霍夫奇点
铜酸盐
抗磁性
光电发射光谱学
位置和动量空间
布里渊区
高温超导
各向异性
准粒子
谱线
电子结构
费米能级
量子力学
磁场
电子
作者
Sudi Chen,M. Hashimoto,Yu He,Dongjoon Song,Junfeng He,Yingfei Li,Shigeyuki Ishida,H. Eisaki,Jan Zaanen,T. P. Devereaux,Dung-Hai Lee,D. H. Lu,Zhi‐Xun Shen
出处
期刊:Nature
[Springer Nature]
日期:2022-01-26
卷期号:601 (7894): 562-567
被引量:6
标识
DOI:10.1038/s41586-021-04251-2
摘要
In conventional superconductors, the phase transition into a zero-resistance and perfectly diamagnetic state is accompanied by a jump in the specific heat and the opening of a spectral gap1. In the high-transition-temperature (high-Tc) cuprates, although the transport, magnetic and thermodynamic signatures of Tc have been known since the 1980s2, the spectroscopic singularity associated with the transition remains unknown. Here we resolve this long-standing puzzle with a high-precision angle-resolved photoemission spectroscopy (ARPES) study on overdoped (Bi,Pb)2Sr2CaCu2O8+δ (Bi2212). We first probe the momentum-resolved electronic specific heat via spectroscopy and reproduce the specific heat peak at Tc, completing the missing link for a holistic description of superconductivity. Then, by studying the full momentum, energy and temperature evolution of the spectra, we reveal that this thermodynamic anomaly arises from the singular growth of in-gap spectral intensity across Tc. Furthermore, we observe that the temperature evolution of in-gap intensity is highly anisotropic in the momentum space, and the gap itself obeys both the d-wave functional form and particle-hole symmetry. These findings support the scenario that the superconducting transition is driven by phase fluctuations. They also serve as an anchor point for understanding the Fermi arc and pseudogap phenomena in underdoped cuprates.
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