Effects of antiferro-ferromagnetic phase coexistence and spin fluctuations on the magnetic and related properties of NdCuSi

被引：14
作者：
Gupta, Sachin [1 ]
Suresh, K. G. [1 ]
Das, A. [2 ]
Nigam, A. K. [3 ]
Hoser, A. [4 ]
机构：
[1] Indian Inst Technol, Dept Phys, Bombay 400076, Maharashtra, India
[2] Bhabha Atom Res Ctr, Div Solid State Phys, Bombay 400085, Maharashtra, India
[3] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India
[4] Helmholtz Zentrum Berlin, D-14109 Berlin, Germany
来源：
APL MATERIALS | 2015年 / 3卷 / 06期
关键词：
GIANT MAGNETORESISTANCE; GD; ND;
D O I：
10.1063/1.4922387
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Polycrystalline NdCuSi is found to show co-existence of antiferromagnetic (AFM) and ferromagnetic (FM) phases at low temperatures, as revealed by neutron diffraction data. The coexistence is attributed to the competing exchange interactions and crystal field effect. The compound shows a large, low-field magnetoresistance (MR) of similar to-32% at 20 kOe below T-N (3.1 K), which becomes similar to-36% at 50 kOe. The MR value at 50 kOe is found to be the highest among the RTX compounds. Magnetocaloric effect (MCE) is also found to show a large value of similar to 11 J/kg K close to TN. Resistivity data show the presence of spin fluctuations, which get suppressed by the applied field. Large MR and MCE in this compound arise due to the coexistence of the two phases. The field dependencies of MR and MCE show quadratic behavior, confirming the presence of spin fluctuations. (C) 2015 Author(s).
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页数：7
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