Solid State Science and Technology, Vol. 17, No 1 (2009) 207-214

ISSN 0128-7389

ELECTRICAL TRANSPORT PROPERTIES OF La0.67(Sr1-xBax)0.33Mn0.9Ti0.1O3 PEROVSKITE MANGANITE

 

Z.Zalita1,2, S.A.Halim1, K.P.Lim1, Z.A. Talib1, Z. Hishamuddin1 and C.P. Walter1

1Department of Physics, Faculty of Science,

Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia

2School of Applied Physics, Faculty of Science and Technology,

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia

 

ABSTRACT

Influence of Ba doping on the structure and electrical transport properties of polycrystalline La0.67(Sr1-xBax)0.33Mn0.9Ti0.1O3 (0 ≤ x ≤ 1.00) perovskite manganites were studied. The samples synthesized by solid-state reaction method experience a transformation from R-3C rhombohedral to Pm3m cubic structure with the increment of Ba concentration. Temperature dependent resistivity showed that the metal-insulator transition temperature decreases from 117 K to 60 K with increasing Ba content up to x = 0.75. The low temperature resistivity below the metal-insulator transition temperature, Tp was well fitted with the ρ = ρo + ρ2T2 equation indicating the contribution of domain or grain boundary mechanisms and the electron-electron scattering mechanism in the conduction. Contrary to that, in the high temperature insulating regime (T > Tp), the resistivity follows variable range hopping (VRH) and small polaron hopping (SPH) conduction mechanisms.

 

http://journal.masshp.net/wp-content/uploads/Journal/2009/Jilid%201/Z.Zalita%20207-214.pdf

 

REFERENCES

[1]. Jin , S., Tiefel, T.H., McCormack, M., Fastnacht, R.A., Ramesh, R. and Chen, J.H. (1994). Thousandfold change in resistivity in magnetoresistive La-Ca-Mn-O films, Science, 264: 413

[2]. Venkataiah, G. & Reddy, P.V. (2005). Electrical behavior of sol-gel prepared Nd0.67Sr0.33MnO3 manganite system, Journal of Magnetism and Magnetic Materials, 285: 343-352.

[3]. Zener, C. (1951). Interaction between d-shells in the transition metals. II. Ferromagnetic compounds of manganese with perovskite structure. Physical Review. 82: 403-405.

[4]. Millis, A.J., Littlewood, P.B. and Shraiman, B.I. (1995). Double exchange alone does not explain the resistivity of La1-xSrxMnO3. Physical Review Letters. 74: 5144-5147.

[5]. Zalita, Z., Halim, S. A., Lim, K. P., Lee, O. J., Walter, C. P., Talib, Z. A. and Hishamuddin, Z. (2008). Structure, Magnetoresistance and Magnetism of La0.67(Sr1.xBax)0.33MnO3 Perovskite, AIP Conf. Proc., 1017: 259-263.

[6]. De Hoff, R.T. (1993). Thermodynamics in Materials Science, McGraw-Hill, 326.

[7]. Mostovshchikovaa, E.V., Loshkarevaa, N.N., Bebenina, N.G. & Mukovskiib, Ya.M.(2006) Optical properties of La0.85(Sr,Ba)0.15MnO3 single crystals in infrared spectral range, Journal of Magnetism and Magnetic Materials, 300: e144.e146.

[8]. Viret, M., Ranno, L. and Coey J. M. D. (1997). Magnetic localization in mixed-valence manganites. Physical Review B, 55: 8067-8070.

[9]. Mott, N.F. & Davis, E.A. (1971). Electronics Processes in Noncrystalline Materials, Oxford: Clarendon.

[10]. Padmavathi, K., Venkataiah, G. & Venugopal Reddy, P. (2007) Electrical behavior of some rare-earth-doped Nd0.33Ln0.34Sr0.33MnO3 manganites. Journal of Magnetism and Magnetic Materials, 309: 237.243

[11]. Banerjee, A., Pal, S., Rozenberg, E. & Chaudhuri, B.K. (2001). Adiabatic and non-adiabatic small polaron hopping conduction in La1-xPbxMnO3+ (0.0 . x . 0.5)-type oxides above the metal-semiconductor transition, Journal of Physics: Condensed Matter, 13: 9489-9504.