EFFECT OF PRESSURE ON 2-MAGNON RAMAN-SCATTERING IN K2NIF4

被引：10
|
作者：
STRUZHKIN, VV
SCHWARZ, U
WILHELM, H
SYASSEN, K
机构：
[1] Max-Planck Institut für Festkörperforschung, 7000 Stuttgart 80
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1993年 / 168卷 / 01期
关键词：
D O I：
10.1016/0921-5093(93)90279-N
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
We measured the effect of pressure (P less-than-or-equal-to 10 GPa) on 2-magnon excitations (T = 10 K) and on lattice parameters (T = 300 K) of K2NiF4 by Raman spectroscopy and X-ray diffraction respectively. The results allow us to determine the dependence of the superexchange interaction J on the transition metal to anion distance d. We find that J scales as J is-proportional-to d(-n) with n = 9.5 +/- 0.5. Previous measurements of 2-magnon excitations under pressure in NiO (n almost-equal-to 7-8), La2CuO4 and Eu2CuO4 (n almost-equal-to 5-6) are analyzed and an explanation for the trends in the pressure dependence of the superexchange interaction J is proposed.
引用
收藏
页码：103 / 106
页数：4
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