Optical spectroscopy of (La, Ca)14Cu24O41 spin ladders:: comparison of experiment and theory

被引：1
|
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, F-91405 Orsay, France
[5] Rhein Westfal TH Aachen, Inst Phys 2, D-52056 Aachen, Germany
来源：
PHYSICA B-CONDENSED MATTER | 2002年 / 312卷
关键词：
spin ladder; bound state; phonon-assisted 2-magnon absorption;
D O I：
10.1016/S0921-4526(01)01199-1
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Transmission and reflectivity of LaxCa14-xCu24O41 two-leg spin-(1)/(2) ladders were measured in the mid-infrared regime between 500 and 12 000 cm(-1). This allows us to determine the optical conductivity a, directly and with high sensitivity. Here we show data for x = 4 and 5 with the electrical field polarized parallel to the rungs (E\\a) and to the legs (E\\c). Three characteristic peaks are identified as magnetic excitations by comparison with two different theoretical calculations. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：617 / 618
页数：2
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