Evolution from a Nodeless Gap to dx2-y2-Wave in Underdoped La2-xSrxCuO4

被引：48

作者：

Razzoli, E. ^{[1
]}

Drachuck, G. ^{[2
]}

Keren, A. ^{[2
]}

Radovic, M. ^{[1
,3
]}

Plumb, N. C. ^{[1
]}

Chang, J. ^{[1
,3
]}

Huang, Y-B ^{[4
,5
]}

Ding, H. ^{[4
,5
]}

Mesot, J. ^{[1
,3
]}

Shi, M. ^{[1
]}

机构：

[1] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland

[2] Technion Israel Inst Technol, Dept Phys, IL-32000 Haifa, Israel

[3] EPF Lausanne, Inst Matiere Complexe, CH-1015 Lausanne, Switzerland

[4] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[5] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 04期

基金：

瑞士国家科学基金会;

关键词：

PREFORMED COOPER PAIRS; CUPRATE SUPERCONDUCTORS; NORMAL-STATE; FERMI ARCS; PHASE; BI2SR2CACU2O8+DELTA; PSEUDOGAP; SYMMETRY;

D O I：

10.1103/PhysRevLett.110.047004

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using angle-resolved photoemission spectroscopy (ARPES), it is revealed that the low-energy electronic excitation spectra of highly underdoped superconducting and nonsuperconducting La2-xSrxCuO4 cuprates are gapped along the entire underlying Fermi surface at low temperatures. We show how the gap function evolves to a d(x2-y2) form with increasing temperature or doping, consistent with the vast majority of ARPES studies of cuprates. Our results provide essential information for uncovering the symmetry of the order parameter(s) in strongly underdoped cuprates, which is a prerequisite for understanding the pairing mechanism and how superconductivity emerges from a Mott insulator. DOI: 10.1103/PhysRevLett.110.047004

引用

页数：5

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