Magnetic resonance of spin clusters and triplet excitations in a spin-Peierls magnet with impurities

被引:7
作者
Glazkov, VN
Eremina, RM
Smirnov, AI
Dhalenne, G
Revcolevschi, A
机构
[1] Russian Acad Sci, PL Kapitza Inst Phys Problems, Moscow 117334, Russia
[2] Zavoiskii Physicotech Inst, Kazan 420029, Russia
[3] Univ Paris Sud, Lab Physicochim Etat Solide, F-91405 Orsay, France
基金
俄罗斯基础研究基金会;
关键词
D O I
10.1134/1.1391531
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The magnetic resonance spectrum of spin clusters formed in spin-Peierls magnets in the vicinity of impurity ions is investigated. The observed temperature dependences of the effective g-factor and the linewidth of the electron paramagnetic resonance (EPR) in crystals of Cu1- xNixGeO3 are described in the model of the exchange narrowing of the two-component spectrum with one component ascribed to spin clusters and exhibiting an anomalous value of the g-factor and the other related to triplet excitations. An estimation of the size of the suppressed dimerization region around the impurity ion is obtained (this region includes about 30 copper ions). The dependence of the effective g-factor and the EPR linewidth on the impurity concentration at low temperatures indicates the interaction of clusters. (C) 2001 MAIK "Nauka/Interperiodica".
引用
收藏
页码:143 / 152
页数:10
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