Low-frequency lattice dynamics in Ba1-xKxBiO3 oxides according to 39K NMR data

被引：1
|
作者：
Mikhalev, KN [1 ]
Verkhovskii, SV
Gerashchenko, AP
Piskunov, YV
Yakubovskii, AY
Rusakov, AP
机构：
[1] Russian Acad Sci, Inst Met Phys, Ural Branch, Ekaterinburg 620219, Russia
[2] Russian Sci Ctr, Kurchatov Inst, Moscow 123182, Russia
[3] Moscow Inst Steels & Alloys, Moscow 117026, Russia
来源：
JETP LETTERS | 1999年 / 70卷 / 05期
关键词：
D O I：
10.1134/1.568178
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The spin-lattice relaxation times T-1 in Ba1-xKxBiO3 (x=0.3, 0.4,0.5) were measured in the normal temperature range (20-300 K). A substantial contribution to the spin-lattice relaxation rate from dynamic local distortions of the crystal lattice near potassium atoms is found. The activation energy of this process increases with decreasing potassium concentration, and the frequency of lattice excitations decreases. The nature of the low-frequency lattice dynamics is discussed. (C) 1999 American Institute of Physics. [S0021-3640(99)00617-9].
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页码：346 / 351
页数：6
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