Correlations of crystallographic defects and anisotropy with magnetotransport properties in FexTaS2 single crystals (0.23 ≤ x ≤ 0.35)

被引：37

作者：

Chen, Chih-Wei ^{[1
]}

Chikara, Shalinee ^{[2
]}

Zapf, Vivien S. ^{[2
]}

Morosan, E. ^{[1
]}

机构：

[1] Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA

[2] Los Alamos Natl Lab, Natl High Magnet Field Lab, Los Alamos, NM 87545 USA

来源：

PHYSICAL REVIEW B | 2016年 / 94卷 / 05期

基金：

美国国家科学基金会;

关键词：

GIANT MAGNETORESISTANCE; TANTALUM DICHALCOGENIDES; INTERLAYER EXCHANGE; MAGNETIC-PROPERTIES; FE/CU MULTILAYERS; ALLOYS; OSCILLATIONS; DEPENDENCE; NIOBIUM;

D O I：

10.1103/PhysRevB.94.054406

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Very large magnetoresistance discovered in single crystals of the ferromagnetic Fe-intercalated transition-metal dichalcogenide Fe0.28TaS2 was attributed to the deviation of the Fe concentration from commensurate values (x = 1/4 or 1/3), which caused magnetic moment misalignments. Here we report a study of FexTaS2 crystals with 0.23 <= x <= 0.35, demonstrating that crystallographic defects lead to spin disorder, which correlates with magnetotransport properties, such as switching magnetic field H-S, magnetoresistance (MR), and even zero-field resistivity rho(0) and temperature coefficient A in rho(T) = rho(0) + AT(2): The ordering temperature T-C and Weiss temperature theta(W) are maximized at the superstructure composition x = 1/4, whereas H-s, MR, rho(0), and A are minimum. Conversely, at a composition intermediate between the superstructure compositions x = 1/4 and 1/3, the corresponding magnetotransport properties reach local maxima.

引用

页数：7

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