Strength of the spin-fluctuation-mediated pairing interaction in a high-temperature superconductor

被引：221

作者：

Dahm, T. ^{[2
]}

Hinkov, V. ^{[1
]}

Borisenko, S. V. ^{[3
]}

Kordyuk, A. A. ^{[3
]}

Zabolotnyy, V. B. ^{[3
]}

Fink, J. ^{[3
,4
]}

Buechner, B. ^{[3
]}

Scalapino, D. J. ^{[5
]}

Hanke, W. ^{[6
]}

Keimer, B. ^{[1
]}

机构：

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

[2] Univ Tubingen, Inst Theoret Phys, D-72076 Tubingen, Germany

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

[4] BESSY, D-12489 Berlin, Germany

[5] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[6] Univ Wurzburg, Inst Theoret Phys, D-97074 Wurzburg, Germany

来源：

NATURE PHYSICS | 2009年 / 5卷 / 03期

关键词：

COPPER-OXIDE SUPERCONDUCTORS; CUPRATE SUPERCONDUCTORS; EXCITATIONS;

D O I：

10.1038/NPHYS1180

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Theories based on the coupling between spin fluctuations and fermionic quasiparticles are among the leading contenders to explain the origin of high-temperature superconductivity, but estimates of the strength of this interaction differ widely(1). Here, we analyse the charge- and spin-excitation spectra determined by angle-resolved photoemission and inelastic neutron scattering, respectively, on the same crystals of the high-temperature superconductor YBa2Cu3O6.6. We show that a self-consistent description of both spectra can be obtained by adjusting a single parameter, the spin-fermion coupling constant. In particular, we find a quantitative link between two spectral features that have been established as universal for the cuprates, namely high-energy spin excitations(2-7) and 'kinks' in the fermionic band dispersions along the nodal direction(8-12). The superconducting transition temperature computed with this coupling constant exceeds 150 K, demonstrating that spin fluctuations have sufficient strength to mediate high-temperature superconductivity.

引用

页码：217 / 221

页数：5

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