Three energy scales characterizing the competing pseudogap state, the incoherent, and the coherent superconducting state in high-Tc cuprates

被引：20

作者：

Okada, Y. ^{[1
]}

Kawaguchi, T. ^{[1
]}

Ohkawa, M. ^{[2
]}

Ishizaka, K. ^{[2
]}

Takeuchi, T. ^{[3
]}

Shin, S. ^{[2
]}

Ikuta, H. ^{[1
]}

机构：

[1] Nagoya Univ, Dept Crystalline Mat Sci, Nagoya, Aichi 4648603, Japan

[2] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

[3] Nagoya Univ, EcoTopia Sci Inst, Nagoya, Aichi 4648603, Japan

来源：

PHYSICAL REVIEW B | 2011年 / 83卷 / 10期

基金：

日本学术振兴会;

关键词：

BI2SR2-XRXCUOY R; FLUCTUATIONS; EXCITATIONS; DEPENDENCE; ONSET; GAPS; LA;

D O I：

10.1103/PhysRevB.83.104502

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have studied the momentum dependence of the energy gap of Bi-2(Sr, R)(2)CuOy by angle-resolved photoemission spectroscopy (ARPES), particularly focusing on the difference between R = La and Eu. By comparing the gap function and characteristic temperatures between the two sets of samples, we show that there exist three distinct energy scales, Delta(pg), Delta(sc0), and Delta(eff)(sc0), which correspond to T* (pseudogap temperature), T-onset (onset temperature of fluctuating superconductivity), and T-c (critical temperature of coherent superconductivity). The results not only support the existence of a pseudogap state below T* that competes with superconductivity, but also the duality of competition and superconducting fluctuation at momenta around the antinode below T-onset.

引用

页数：6