Magnetic excitations in PrBa2Cu4O8 explored by Raman scattering

被引：0

作者：

Litvinchuk, AP ^{[1
]}

Börjesson, L

Thomsen, C

Chu, CW

机构：

[1] Univ Houston, Texas Ctr Superconduct, Houston, TX 77204 USA

[2] Univ Houston, Dept Phys, Houston, TX 77204 USA

[3] Chalmers Univ Technol, Dept Appl Phys, S-41296 Gothenburg, Sweden

[4] Tech Univ Berlin, Inst Festkorperphys, Sekr PN 5 4, D-10623 Berlin, Germany

来源：

PHYSICA STATUS SOLIDI B-BASIC RESEARCH | 1999年 / 215卷 / 01期

关键词：

D O I：

10.1002/(SICI)1521-3951(199909)215:1<507::AID-PSSB507>3.3.CO;2-B

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Polarized Raman scattering spectra of PrBa2Cu4O8 were studied in the temperature range 10 to 300 K. An anomalous temperature dependence of the two-magnon peak was found, which softens upon cooling from about 2590 cm(-1) at 300 K to 2480 cm(-1) at 10 K. The observed behavior is opposite to what is known for RBa2Cu3O6, R2CuO4 (R = rare earth) and KMnF3-type antiferromagnets, where the two-magnon peak shifts to higher frequencies upon decreasing the in-plane Cu-O bond length due to either lowering temperature or applying pressure. The experimental data are discussed in view of the semiconductor-metal transition which, according to recent optical and transport studies, occurs in PrBa2Cu4O8 at T* approximate to 150 K.

引用

页码：507 / 512

页数：6

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