Modeling scanning tunneling spectra of Bi2Sr2CaCu2O8+δ -: art. no. 224502

被引：58

作者：

Hoogenboom, BW

Berthod, C

Peter, M

Fischer, O

Kordyuk, AA

机构：

[1] Univ Geneva, DPMC, CH-1211 Geneva 4, Switzerland

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

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

来源：

PHYSICAL REVIEW B | 2003年 / 67卷 / 22期

关键词：

D O I：

10.1103/PhysRevB.67.224502

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Recent angle-resolved photoemission spectroscopy (ARPES) and neutron scattering data have provided ingredients for the interpretation of scanning tunneling spectra on Bi2Sr2CaCu2O8+delta. We analyze the low-temperature tunneling spectra, from oxygen overdoped to underdoped samples, including details about the bilayer splitting and the neutron resonance peak. Two van Hove singularities are identified: the first is integrated in the coherence peaks, the second is heavily broadened at higher binding energy. The shape of the tunneling spectra suggests a strong coupling of the quasiparticles with a collective mode, and a comparison with photoemission shows that the scattering rate in tunneling is an order of magnitude smaller than in ARPES. Finally, the theoretical spectra calculated with an isotropic tunneling matrix element are in better agreement with the experimental data than those obtained with anisotropic matrix elements.

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页数：7

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