Nonmonotonic pseudogap in high-Tc cuprates

被引：42

作者：

Kordyuk, A. A. ^{[1
,2
]}

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

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

Schuster, R. ^{[1
]}

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

Evtushinsky, D. V. ^{[1
]}

Plyushchay, A. I. ^{[2
]}

Follath, R. ^{[3
]}

Varykhalov, A. ^{[3
]}

Patthey, L. ^{[4
]}

Berger, H. ^{[5
]}

机构：

[1] IFW Dresden, D-01171 Dresden, Germany

[2] Natl Acad Sci Ukraine, Inst Met Phys, UA-03142 Kiev, Ukraine

[3] BESSY, D-12489 Berlin, Germany

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

[5] Ecole Polytech Fed Lausanne, Inst Phys Matiere Complexe, CH-1015 Lausanne, Switzerland

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 02期

关键词：

bismuth compounds; calcium compounds; entropy; high-temperature superconductors; lead compounds; metal-insulator transition; phase diagrams; photoelectron spectra; strontium compounds; superconducting energy gap; terbium compounds; STATE;

D O I：

10.1103/PhysRevB.79.020504

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The mechanism of high-temperature superconductivity has not been resolved for so long because the normal state of cuprates, which exhibits enigmatic pseudogap phenomena, is not yet understood. We performed careful temperature- and momentum-resolved photoemission experiments to show that the depletion of the spectral weight in slightly underdoped cuprate superconductor, usually called the "pseudogap," exhibits an unexpected nonmonotonic temperature dependence: decreases linearly approaching T-* at which it reveals a sharp transition but does not vanish and starts to increase gradually again at higher temperature. The low-temperature behavior of the pseudogap is remarkably similar to one of the incommensurate charge ordering gap in the transition-metal dichalcogenides, while the reopening of the gap at room temperature fits the scenario of temperature-driven metal-insulator transition. This observation suggests that two phenomena, the electronic instability to density-wave formation and the entropy-driven metal-to-insulator crossover, may coexist in the normal state of cuprates.

引用

页数：4

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