Two Energy Gaps and Fermi-Surface "Arcs" in NbSe2

被引：194

作者：

Borisenko, S. V. ^{[1
]}

Kordyuk, A. A. ^{[1
]}

Zabolotnyy, V. B. ^{[1
]}

Inosov, D. S. ^{[1
]}

Evtushinsky, D. ^{[1
]}

Buechner, B. ^{[1
]}

Yaresko, A. N. ^{[2
]}

Varykhalov, A. ^{[3
]}

Follath, R. ^{[3
]}

Eberhardt, W. ^{[3
]}

Patthey, L. ^{[4
]}

Berger, H. ^{[5
]}

机构：

[1] IFW Dresden, Leibniz Inst Solid State Res, D-01171 Dresden, Germany

[2] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany

[3] BESSY, Helmhotz Ctr Berlin, D-12489 Berlin, Germany

[4] Paul Scherrer Inst, Swiss Light Source, CH-5234 Villigen, Switzerland

[5] Ecole Polytech Fed Lausanne, Inst Phys Complex Matter, CH-1015 Lausanne, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 16期

关键词：

CHARGE-DENSITY-WAVE; TRANSITION-METAL DICHALCOGENIDES; DEPENDENT SUPERCONDUCTIVITY; 2H-NBSE2; 2H-TASE2; MECHANISM; STATE;

D O I：

10.1103/PhysRevLett.102.166402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using angle-resolved photoemission spectroscopy, we report on the direct observation of the energy gap in 2H-NbSe2 caused by the charge-density waves (CDW). The gap opens in the regions of the momentum space connected by the CDW vectors, which implies a nesting mechanism of CDW formation. In remarkable analogy with the pseudogap in cuprates, the detected energy gap also exists in the normal state (T > T-0) where it breaks the Fermi surface into "arcs," it is nonmonotonic as a function of temperature with a local minimum at the CDW transition temperature (T-0), and it forestalls the superconducting gap by excluding the nested portions of the Fermi surface from participating in superconductivity.

引用

页数：4

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