Magnetic excitations in two-leg spin 1/2 ladders:: experiment and theory

被引：15

作者：

Grüninger, M

Windt, M

Nunner, T

Knetter, C

Schmidt, KP

Uhrig, GS

Kopp, T

Freimuth, A

Ammerahl, U

Büchner, B

Revcolevschi, A

机构：

[1] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany

[2] Univ Augsburg, D-86135 Augsburg, Germany

[3] Univ Cologne, Inst Theoret Phys, D-50937 Cologne, Germany

[4] Univ Paris 11, Lab Physicochim Etat Solide, F-91405 Orsay, France

[5] Rhein Westfal TH Aachen, Inst Phys 2, D-52056 Aachen, Germany

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2002年 / 63卷 / 12期

关键词：

infrared spectroscopy; magnetic properties;

D O I：

10.1016/S0022-3697(02)00251-2

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Magnetic excitations in two-leg S = 1/2 ladders are studied both experimentally and theoretically. Experimentally, we report on the reflectivity, the transmittance and the optical conductivity sigma(omega) of undoped LaxCa14-xCu24O41 for x = 4, 5, and 5.2. Using two different theoretical approaches (Jordan-Wigner fermions and perturbation theory), we calculate the dispersion of the elementary triplets, the optical conductivity and the momentum-resolved spectral density of two-triplet excitations for 0.2 less than or equal to J(\\)/J(perpendicular to) less than or equal to 1.2. We discuss phonon-assisted two-triplet absorption, the existence of two-triplet bound states, the two-triplet continuum, and the size of the exchange parameters. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

收藏

页码：2167 / 2173

页数：7

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