Magnetic/structural phase diagram and zero temperature coefficient of resistivity in GaCFe3-xCox (0 ≤ x ≤ 3.0)

被引：10
作者：
Kan, X. C. [1 ,2 ]
Wang, B. S. [1 ]
Lin, S. [1 ]
Yuan, B. [1 ]
Zu, L. [1 ,2 ]
Wang, X. F. [1 ,2 ]
Lin, J. C. [1 ]
Tong, P. [1 ]
Song, W. H. [1 ]
Sun, Y. P. [1 ,3 ,4 ]
机构：
[1] Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China
[2] Univ Sci & Technol China, Hefei 230026, Peoples R China
[3] Chinese Acad Sci, High Field Magnet Lab, Hefei 230031, Peoples R China
[4] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2016年 / 663卷
基金：
中国国家自然科学基金;
关键词：
Magnetic/structural phase diagram; Antiperovskite; Zero TCR; SPIN-GLASS; TRANSITION; COMPOUND;
D O I：
10.1016/j.jallcom.2015.12.156
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Magnetic/structural phase diagram of GaCFe3-xCox (0 <= x <= 3.0) were investigated systematically. It was found that the antiperovskite phase collapses at x = 0.90 and recovers again at x = 2.3 with Co doping. Along with this transformation, the ferromagnetic state in GaCFe3 is suppressed and replaced by the reentrant spin-glass state (2.3 <= x <= 2.6) or enhanced magnetic fluctuations (2.7 <= x <= 3.0). Ac susceptibility and magnetic relaxation were adopted to validate this spin-glass state for x = 2.5. It indicates that the contractive lattice as well as the resultant enhanced magnetic couplings may be an important origin of the collapsed antiperovskite structure. Zero temperature coefficient of resistivity (TCR) was achieved by Co-doping where the sign of TCR changes from positive to negative across the room temperature. The optimized TCR 0.0346 ppm/K spanning 110 K are three orders of magnitude smaller than those of CuNMn3 or GaCFe3. The physical mechanism was discussed. (C) 2015 Elsevier B.V. All rights reserved.
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页码：94 / 99
页数：6
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