Unusual strong-coupling effects in the tunneling spectroscopy of optimally doped and overdoped Bi2Sr2CaCu2O8+δ

被引：172

作者：

DeWilde, Y ^{[1
]}

Miyakawa, N

Guptasarma, P

Iavarone, M

Ozyuzer, L

Zasadzinski, JF

Romano, P

Hinks, DG

Kendziora, C

Crabtree, GW

Gray, KE

机构：

[1] Argonne Natl Lab, Sci & Technol Ctr Supercond, Argonne, IL 60439 USA

[2] Sci Univ Tokyo, Dept Appl Phys, Shinjuku Ku, Tokyo 162, Japan

[3] IIT, Chicago, IL 60616 USA

[4] USN, Res Lab, Washington, DC 20375 USA

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 80卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.80.153

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Tunneling spectroscopy measurements are reported on single crystals of Bi2Sr2CaCu2O8+delta using vacuum tunneling and point-contact methods. A reproducible dip feature in the tunneling conductance is found near /eV/ = 2 Delta, observed for both voltage polarities in the best resolved spectra. With overdoping the position of the dip continues to scale with a, and its magnitude decreases as a decreases. These results indicate that the dip feature arises from a strong-coupling effect whereby the quasiparticle lifetime is decreased at a characteristic energy of similar to 2 Delta, consistent with an electron-electron pairing interaction.

引用

页码：153 / 156

页数：4

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