Pseudogap and collective mode in the optical conductivity spectra of hole-doped ladders in Sr14-xCaxCu24O41

被引：69

作者：

Osafune, T ^{[1
]}

Motoyama, N

Eisaki, H

Uchida, S

Tajima, S

机构：

[1] Univ Tokyo, Dept Superconduct, Bunkyo Ku, Tokyo 1138656, Japan

[2] ISTEC, Superconduct Res Lab, Koto Ku, Tokyo 1350062, Japan

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 82卷 / 06期

关键词：

D O I：

10.1103/PhysRevLett.82.1313

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Anisotropic optical conductivity spectra have been investigated for the hole-doped two-leg ladder system Sr14-xCaxCu24O41. As in the case of the underdoped high-T-c cuprates, upon cooling a pseudogap opens in the spectrum for the transverse (a-axis) polarization, and concurrently a peak develops in the far infrared region of the longitudinal (c-axis) spectrum. A possible interpretation for these results is that the pseudogap signals a formation of hole pairs on the ladders and the peak might correspond to a pinned collective mode of a regular array of hole pairs. [S0031-9007(99)08340-9].

引用

页码：1313 / 1316

页数：4

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