Electromagnetic Property of Co-doped La0.8Sr0.2MnO3 Perovskite Manganese Oxides

doi:10.15541/jim20180047

Abstract

Abstract:

La_0.8Sr_0.2Mn_1-_xCo_xO₃(x = 0, 0.1, 0.3) samples were prepared via the conventional high-temperature solid-state reaction method. The effects of Co doping on Griffiths phase, magnetic entropy change, critical behavior, and electrical transport properties of La_0.8Sr_0.2MnO₃ (LSMO) polycrystalline samples were systematically investigated. Results show that the prepared polycrystalline samples all have rhombohedral symmetry structures with Griffiths phase above the low temperature magnetic transition temperature (T_C2). When magnetic field is applied to the La_0.8Sr_0.2Mn_1-_xCo_xO₃ (x = 0, 0.1, 0.3) samples, the maximum magnetic entropy change ΔS_max for 7 T is -2.88, -2.05, and -2.75 J/(kg·K), respectively. Doping of Co element makes ΔS_maxdecrease first and then increase. The critical behavior of the parent phase fits best with the mean field model, and that of the sample after doping fits best with the 3D Heisenberg model. The mother phase is a semiconductor material, and the metal insulator transition appears near the low temperature magnetic transition temperature (T_C2) when the Co element doping amount reaches 0.1. The conductivity of the three samples in high temperature region satisfies the small polaron model.

Key words: perovskite manganese oxide, Griffiths-like phase, critical exponent, electrical (electrical property)

CLC Number:

TQ174

LIU Jiao, WANG Wen-Qing, WU Hong-Ye, TIAN Ye, CAO Feng-Ze, ZHAO Jian-Jun. Electromagnetic Property of Co-doped La_0.8Sr_0.2MnO₃ Perovskite Manganese Oxides[J]. Journal of Inorganic Materials, 2018, 33(11): 1237-1247.

Figures/Tables 12

Fig. 1 XRD patterns of La0.8Sr0.2Mn1-xCoxO3(x=0, 0.1, 0.3) samples

Table 1 Lattice parameters and cell volume of La0.8Sr0.2Mn1-xCoxO3(x=0, 0.1 and 0.3) samples

Sample	a/nm	b/nm	V/nm³	c/nm
x=0	0.550993	0.5522	0.2032339	0.667965
x=0.1	0.551356	0.551354	0.2028696	0.667351
x=0.3	5.49571	5.49557	201.3505	6.66678

Fig. 2 M-T curves (a)~(c) and χT-T curves(d)~(f) for the La0.8Sr0.2Mn1-xCoxO3(x=0, 0.1, 0.3) samples at 0.01T magnetic field with the insets showing the corresponding dMFC/dT-T curves

Fig. 3 Mirr-T curves of La0.8Sr0.2Mn1-xCoxO3 (x = 0, 0.1, 0.3) samples at 0.01 T applied magnetic field

Fig. 4 χ-1-T curves of the La0.8Sr0.2Mn1-xCoxO3(x=0, 0.1, 0.3) samples under a 0.01T magnetic field with the insets showing the lgχ-1 -lgtm curves at 0.01T, where tm=(T-TC)/TC

Fig. 5 M-H curves((a-c)) and isothermal Arrott curves ((d)~(f), H/M versus M2) of the magnetization of samples La0.8Sr0.2Mn1-xCoxO3 (x = 0, 0.1, 0.3) varying with the applied magnetic field at different temperatures

Fig. 6 Fitting of La0.8Sr0.2MnO3(A), La0.8Sr0.2Mn0.9Co0.1O3(B) and La0.8Sr0.2Mn0.7Co0.3O3(C) sample curves to mean field, 3D-Heisenberg, 3D-Ising, and tricritical models

Fig. 7 Curves of spontaneous magnetization at temperatures below the Curie temperature for La0.8Sr0.2MnO3(A), La0.8Sr0.2Mn0.9Co0.1O3(B) and La0.8Sr0.2Mn0.7Co0.3O3(C) sample versus temperature MS-T (a), MS (dMs/dT)-1-T and their fitted straight lines (b); Curves of zero-field susceptibility reciprocal at temperatures above the Curie temperature for La0.8Sr0.2Mn0.7Co0.3O3 sample versus temperature χ0-1-T (c), χ0-1 (dχ0-1/dT)-1-T and their fitted straight lines(d); The illustrations are for the corresponding Arrott-Plot

Fig. 8 Curves of magnetic entropy change with temperature for the samples La0.8Sr0.2Mn1-xCoxO3 (x = 0 (a), 0.1 (b), 0.3 (c)) under the same magnetic field of 108~278 K, 100~300 K and 110~285 K, respectively (-ΔS-T)

Fig. 9 Resistivity of samples La0.8Sr0.2Mn1-xCoxO3 (x = 0, 0.1, 0.3) versus temperature

Fig. 10 Change of magnetoresistance with temperature (MR-T) at 2 T for La0.8Sr0.2Mn1-xCoxO3 (x = 0, 0.1, 0.3)

Fig. 11 Model fitting curves of La0.8Sr0.2Mn1-xCoxO3 (x=0, 0.1, 0.3), (ln(ρ-T-1), (ln(ρ/T)-T-1)and (lnρ-T-1/4) curves

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Electromagnetic Property of Co-doped La_0.8Sr_0.2MnO₃ Perovskite Manganese Oxides

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