Electrical Transport Properties in La0.7Ca0.3-xSrxMnO3 Thin Films

doi:10.15541/jim20150397

Abstract

Abstract:

The influence of the chemical composition on the structure, magnetic and electrical transport properties of La_0.7Ca_0.3-_xSr_xMnO₃ (LCSMO, x≤0.05) thin films was systematically studied. LCSMO thin films were prepared by Sol-Gel method. XRD results show that all the films have typical perovskite structure. With increase of Sr doping concentration, both Curie temperature T_C and metal-insulator transition temperature T_MI of LCSMO thin films increase monotonously. When Sr doping concentration x≤0.05, with increase of temperature, absolute value of MR decreases first, then increases to a maximum value around T_MI, and finally decreases, which indicates that the disorder coming from phase separation around T_MI contributes greatly to MR. The field dependence of MR values at certain temperature can be classified into two kinds. When the temperature is much lower than T_MI, dual gradient of MR with the magnetic field is shown. The tunneling effect on the grain boundaries plays a dominant part in the low magnetic field, and this effect is particularly sensitive to the magnetic field; the suppression of spin fluctuations by magnetic field is the main reason in the high magnetic field range. When the temperature is higher than T_MI, MR of LCSMO thin films changes almost linearly with the magnetic field which is mainly due to suppression of spin fluctuations by magnetic field.

Key words: manganese oxides, Sol-Gel method, transport properties

CLC Number:

TQ174

ZHANG Yuan-Yuan, TANG Xiao-Dong, CHEN Ying, WANG Gen-Shui, DONG Xian-Lin. Electrical Transport Properties in La_0.7Ca_0.3-_xSr_xMnO₃ Thin Films[J]. Journal of Inorganic Materials, 2016, 31(3): 274-278.

Figures/Tables 4

Fig. 1 XRD patterns of La0.7(Ca0.3-xSrx)MnO3 thin films(a) x=0; (b) x=0.025; (c) x=0.05

Fig. 2 Temperature dependence of the magnetizations under an external magnetic field of 500 Oe of La0.7(Ca0.3-xSrx)MnO3 thin films (a) x=0; (b) x=0.025; (c) x=0.05

Fig. 3 (a) Temperature dependence of the resistivity without external magnetic field and (b) temperature dependence of magneto-resistance (MR) ratio (here defined as (ρ(3T)-ρ(0T))/ ρ(0T)%) of La0.7(Ca0.3-xSrx)MnO3 thin films)

Fig. 4 Magnetic field dependence of the MR values at different temperatures(a) 10 K; (b) 125 K; (c) 220 K; (d) 300 K

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Electrical Transport Properties in La_0.7Ca_0.3-_xSr_xMnO₃ Thin Films

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