MOSSBAUER INVESTIGATION OF SPIN-LATTICE RELAXATION OF PARAMAGNETIC FE-3+ IONS IN NH4AL(SO4)2 12H2O

被引：38

作者：

BHARGAVA, SC ^{[1
]}

KNUDSEN, JE ^{[1
]}

MORUP, S ^{[1
]}

机构：

[1] TECH UNIV DENMARK,APPL PHYS LAB 2,DK-2800 LYNGBY,DENMARK

来源：

JOURNAL OF PHYSICS C-SOLID STATE PHYSICS | 1979年 / 12卷 / 14期

关键词：

D O I：

10.1088/0022-3719/12/14/023

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Mossbauer spectra of Fe3+ in NH4Al(SO 4)2.12H2O have been obtained in the temperature range of 79-295K with applied magnetic fields of 5.7-12.3 kG. The spectra exhibit electronic spin relaxation with a relaxation time that depends strongly on the temperature and to some extent on the applied field. The spectra have been successfully fitted using the stochastic relaxation model. The relaxation is explained in terms of two spin-lattice relaxation processes: first-order Raman processes involving an internal vibrational mode of the Fe(H 2O)63+ complex and a contribution which has been attributed to spin-lattice relaxation processes induced by critical crystal-field fluctuations, associated with the phase transition in the alum.

引用

页码：2879 / 2896

页数：18

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