INFLUENCE OF FORCE-CONSTANT CHANGES AND LOCALIZED MODES ON V - FE57 MOSSBAUER SYSTEM

被引：40

作者：

MANNHEIM, PD

SIMOPOULOS, A

机构：

[1] Department of Nuclear Physics, Weizmann Institute of Science, Rehovoth

[2] Soreq Nuclear Research Center, Yavne

[3] Nuclear Research Center Democritos, Athens

来源：

PHYSICAL REVIEW | 1968年 / 165卷 / 03期

关键词：

D O I：

10.1103/PhysRev.165.845

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

An experimental and theoretical study is made of the Mössbauer effect of Fe57 in a vanadium matrix. We have measured the recoil-free fraction and second-order Doppler shift over the temperature range 100 to 700°K. The experimental results are interpreted using recently derived expressions for the mean-square velocity and displacement of the defect which allow for changes in the force constants as well as the mass at the impurity site. A good fit to the data is obtained for an increase in force constant of approximately 2.5. The data are also analyzed in the high-temperature limit to confirm this increase. Evidence for the presence of localized modes is found from the velocity shift, and the positions of the modes are determined. © 1968 The American Physical Society.

引用

页码：845 / +

页数：1

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