Infrared signatures of the spin-Peierls transition in CuGeO3

被引：28

作者：

Damascelli, A

vanderMarel, D

Parmigiani, F

Dhalenne, G

Revcolevschi, A

机构：

[1] POLITECN MILAN, INFM, I-20133 MILAN, ITALY

[2] POLITECN MILAN, DIPARTIMENTO FIS, I-20133 MILAN, ITALY

[3] UNIV PARIS 11, CHIM SOLIDE LAB, F-91405 ORSAY, FRANCE

来源：

PHYSICAL REVIEW B | 1997年 / 56卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.56.R11373

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigated the infrared reflectivity of several Mg-and Si-substituted CuGeO3 single crystals. The temperature-dependent b-axis and c-axis optical response is reported. For T < T-SP we detected the activation of zone-boundary phonons along the b axis of the crystal on the pure sample and for 1% Mg and 0.7% Si concentrations. From a detailed analysis of the phonon parameters the redshift of the B-2u mode at 48 cm(-1) is observed and discussed in relation to the soft mode expected to drive the spin-Peierls phase transition in CuGeO3. Moreover, the polarization dependence of a magnetic excitation measured in transmission at 44 cm(-1) has been investigated. [S0163-1829(97)51942-4].

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页码：11373 / 11376

页数：4

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