Persistence of strong electron coupling to a narrow boson spectrum in overdoped Bi2Sr2CaCu2O8+δ tunneling data -: art. no. 017004

被引:54
作者
Zasadzinski, JF [1 ]
Ozyuzer, L
Coffey, L
Gray, KE
Hinks, DG
Kendziora, C
机构
[1] IIT, Chicago, IL 60616 USA
[2] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA
[3] Izmir Inst Technol, TR-35437 Izmir, Turkey
[4] USN, Res Lab, Washington, DC 20375 USA
关键词
D O I
10.1103/PhysRevLett.96.017004
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
A d-wave, Eliashberg analysis of break-junction and STM tunneling spectra on Bi2Sr2CaCu2O8+delta (Bi2212) reveals that the spectral dip feature is directly linked to strong electronic coupling to a narrow boson spectrum, evidenced by a large peak in alpha F-2(omega). The tunneling dip feature remains robust in the overdoped regime of Bi2212 with bulk T-c values of 56 K-62 K. This is contrary to recent optical conductivity measurements of the self-energy that suggest the narrow boson spectrum disappears in overdoped Bi2212 and therefore cannot be essential for the pairing mechanism. The discrepancy is resolved by considering the way each technique probes the electron self-energy, in particular, the unique sensitivity of tunneling to the off-diagonal or pairing part of the self-energy.
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页数:4
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