Transport Behavior and Magnetism of Colossal Magnetoresistance Materials A0.05Co0.95Cr2S4 (A=Zn, Ni, Cd, Fe)

doi:10.15541/jim20150563

Abstract

Abstract:

Spinel-type transition metal sulfides possess various super physical properties including colossal magnetoresistance (CMR). The research of the mechanism of the CMR effect is of great value for the development of the CMR sulfide materials, whereas the CMR effect of the spinel chrome-based sulfides is unclear up till now. The A_0.05Co_0.95Cr₂S₄ (A=Zn, Ni, Cd, Fe) samples were prepared by solid-state reaction method. Their effects of magnetic and non-magnetic metal elements on crystal structure and magnetic properties of CoCr₂S₄ after doping were studied. XRD measurement shows that the doped A_0.05Co_0.95Cr₂S₄ (A=Zn, Ni, Cd, Fe) samples exhibit pure spinel structure, in which their crystal cell parameters increase proportional to the ionic radius of the doping elements. Magnetoresistance measurement shows that all the samples exhibit giant magnetoresistance effect. Doping weakens the ferromagnetic interaction, which leads to the decrease of T_C of A_0.05Co_0.95Cr₂S₄ (A=Zn, Ni, Cd, Fe). In the low field of 0.01 T, the curves of the zero-field cooling (ZFC) and field cooling (FC) exhibit magnetic irreversible phenomena. All the samples exhibit typical ferrimagnetic hysteresis loops, among which Zn_0.05Co_0.95Cr₂S₄ shows the largest value of coercivity.

Key words: A0.05Co0.95Cr2S4, colossal magnetoresistance, ZFC, FC, coercive field

CLC Number:

O482

LU Xiao-Yu, JIA Nan, FANG Bi-Jun, YANG Zhao-Rong, ZHANG Yu-Heng. Transport Behavior and Magnetism of Colossal Magnetoresistance Materials A_0.05Co_0.95Cr₂S₄ (A=Zn, Ni, Cd, Fe)[J]. Journal of Inorganic Materials, 2016, 31(7): 699-704.

Figures/Tables 7

Fig. 1 XRD patterns of A0.05Co0.95Cr2S4 (A=Zn、Ni、Cd、Fe)

Table 1 Ionic radius of doping elements and unit cell parameter of A0.05Co0.95Cr2S4 (A=Zn、Fe、Ni、Cd)

Doping element	Fe	Zn	Ni	Cd
Ionic radius/nm	0.063	0.060	0.055	0.078
Cell parameter, a/nm	0.99325	0.99317	0.99253	0.99402

Fig. 2 Temperature dependence of resistivity and magnetoresistance measured at zero field and 4.5 T and the relationships of lnρ-1000/T under zero field (insets)(a) Fe0.05Co0.95Cr2S4; (b) Zn0.05Co0.95Cr2S4; (c) Ni0.05Co0.95Cr2S4

Table 2 The magnetoresistance parameters of A0.05Co0.95Cr2S4(A=Zn、Fe、Ni、Cd)

Doping element	Fe	Zn	Ni	Cd
MR_4.5T	0.0290	0.1800	0.0035	—
E_H/meV	37	126	308	—
E_L/meV	18	45	119	—
T_C/K	218	215	218	213
H_C/T	0.01972	0.03712	0.01546	0.01998

Fig. 3 The curve of resistivity change with temperature of Cd0.05Co0.95Cr2S4 under zero field

Fig. 4 The relationships of ZFC and FC magnetization versus temperature measured at H=0.01 T of A0.05Co0.95Cr2S4 (A=Fe、Zn、Ni、Cd)(a) Cd0.05Co0.95Cr2S4 and Fe0.05Co0.95Cr2S4; (b) Zn0.05Co0.95Cr2S4 and Ni0.05Co0.95Cr2S4

Fig. 5 Magnetic hysteresis loops of A0.05Co0.95Cr2S4 (A=Fe、Zn、Ni、Cd) measured at 5 K(a) Fe0.05Co0.95Cr2S4; (b) Zn0.05Co0.95Cr2S4; (c) Ni0.05Co0.95Cr2S4; (d) Cd0.05Co0.95Cr2S4

References 20

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Transport Behavior and Magnetism of Colossal Magnetoresistance Materials A_0.05Co_0.95Cr₂S₄ (A=Zn, Ni, Cd, Fe)

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