Spin dynamics of Sr14Cu24O41 two-leg ladder studied by raman spectroscopy -: art. no. 197202

被引：36

作者：

Gozar, A

Blumberg, G ^{[1
]}

Dennis, BS

Shastry, BS

Motoyama, N

Eisaki, H

Uchida, S

机构：

[1] Lucent Technol, Bell Labs, Murray Hill, NJ 07974 USA

[2] Univ Illinois, Urbana, IL 61801 USA

[3] Univ Tokyo, Bunkyo Ku, Tokyo 113, Japan

[4] Stanford Univ, Stanford, CA 94305 USA

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 87卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.87.197202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The two-magnon (2M) excitation at 3000 cm(-1) in Sr14Cu24O41 two-leg ladder is studied by Raman scattering. A slight anisotropy of the superexchange coupling J(perpendicular to)/J(parallel to) approximate to 0.8 with J(parallel to) = 110 +/- 20 meV is proposed from the analysis of the magnetic scattering. The resonant coupling across the charge transfer gap increases the 2M intensity by orders of magnitude. The anisotropy of Raman scattering is dependent upon the excitation energy. The 2M relaxation is found to be correlated with the temperature dependent electronic Raman continuum at low frequencies.

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页码：197202 / 1

页数：4

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