Gap anisotropy and universal pairing scale in a spin-fluctuation model of cuprate superconductors

被引：49

作者：

Abanov, Ar. ^{[1
]}

Chubukov, A. V. ^{[2
]}

Norman, M. R. ^{[3
]}

机构：

[1] Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA

[2] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA

[3] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 22期

关键词：

d-wave superconductivity; exchange interactions (electron); Fermi surface; fluctuations in superconductors; high-temperature superconductors; spin fluctuations;

D O I：

10.1103/PhysRevB.78.220507

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We consider the evolution of d(x)(2)-y(2) pairing, mediated by nearly critical spin fluctuations, with the coupling strength. We show that the onset temperature for pairing, T(*), smoothly evolves between weak and strong couplings passing through a broad maximum at intermediate coupling. At strong coupling, T(*) is of order of the magnetic exchange energy J. We argue that for all couplings, pairing is confined to the vicinity of the Fermi surface. We also find that thermal spin fluctuations only modestly reduce T(*), even at criticality, but they substantially smooth the gap anisotropy. The latter evolves with coupling being the largest at weak coupling.

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页数：4

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