Interplay between magnetic order and the vibrational state of Fe in FeCr2S4

被引：15
作者：
Klencsár, Z
Kuzmann, E
Homonnay, Z
Vértes, A
Simopoulos, A
Devlin, E
Kallias, G
机构：
[1] Eotvos Lorand Univ, Hungarian Acad Sci, Dept Nucl Chem, Res Grp Nucl Methods Struct Chem, H-1117 Budapest, Hungary
[2] NCSR Demokritos, Inst Sci Mat, Athens 15310, Greece
来源：
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2003年 / 64卷 / 02期
关键词：
chalcogenides; magnetoresistance; Mossbauer spectroscopy;
D O I：
10.1016/S0022-3697(02)00308-6
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The temperature dependence of the Fe-57 Mossbauer recoilless fraction, and that of the local electronic and magnetic state of iron in the chalcogenide spinel FeCr2S4 have been studied in detail around the Curie temperature with the help of Fe-57 Mossbauer spectroscopy. Ferrimagnetic order was found to break down anomalously at similar to20 K below the Curie temperature in FeCr2S4. Magnetic relaxation of iron magnetic moments was observed with increasing relaxation rate above T similar to 155 K. The local Debye temperature as well as the effective vibrating mass, representative for the local vibrational state of iron, was found to be considerably higher in the paramagnetic state than in the magnetically ordered state. At T = 186.5 K long range magnetic order was found to develop in response to 6 T external magnetic field showing that in FeCr2S4 short-range magnetic order persists well above the Curie temperature. (C) 2002 Elsevier Science Ltd. All rights reserved.
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收藏
页码：325 / 331
页数：7
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