Anomalous magnetotransport behavior in Fe-doped MnNiGe alloys

被引:29
|
作者
Dutta, P. [1 ]
Pramanick, S. [2 ]
Singh, Vijay [3 ,4 ]
Major, Dan Thomas [3 ,4 ]
Das, D. [1 ]
Chatterjee, S. [1 ]
机构
[1] UGC DAE Consortium Sci Res, Kolkata Ctr, Sect 3,LB-8, Kolkata 700098, India
[2] Indian Assoc Cultivat Sci, Dept Solid State Phys, 2A & B Raja SC Mullick Rd, Kolkata 700032, India
[3] Bar Ilan Univ, Dept Chem, IL-52900 Ramat Gan, Israel
[4] Bar Ilan Univ, Lise Meitner Minerva Ctr Computat Quantum Chem, IL-52900 Ramat Gan, Israel
关键词
SHAPE-MEMORY ALLOYS; MAGNETIC PHASE-DIAGRAM; AUGMENTED-WAVE METHOD; ELECTRONIC-STRUCTURE; MAGNETORESISTANCE; TRANSITION; COMPOUND;
D O I
10.1103/PhysRevB.93.134408
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The electrical dc transport properties of hexagonal magnetic equiatomic alloys of nominal composition Mn1-xFexNiGe (x = 0.2 and 0.25) have been investigated experimentally as well as theoretically using first-principles electronic structure calculations. Thermal hysteresis in the magnetization data indicates that the alloys undergo a first-order martensitic transition. Both the alloys show unusual nonmetallic resistivity behavior and a noticeable amount of training effect in resistivity when thermally cycled through the first-order martensitic transition. We observe moderate negative magnetoresistance (similar to-11.5% for 150 kOe) at 5 K (well below the martensitic transition temperature) associated with clear virgin line effect for both the alloys. We have adapted different flavors of density functional theory approach to understand the experimentally observed nonmetallic transport behavior.
引用
收藏
页数:8
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