Solid State Science and Technology, Vol. 14, No 1 (2006) 75-80

ISSN 0128-7389

75

EFFECT OF Nd SUBSTITUTION ON ELECTRICAL TRANSPORT AND

MAGNETORESISTIVE PROPERTIES OF La2/3Ba1/3MnO3

A. Huda, S.A.Halim, S.Elias, A.A.Sidek, Z.Hishamuddin, K.P.Lim, O.J. Lee, I.Priscilla

Superconductor and Thin Films Laboratory, Department of Physics,

Faculty of Science, University Putra Malaysia,

43400 Serdang, Selangor, Malaysia

 

ABSTRACT

 

Polycrystalline semples of (La1-xNdx)2/3Ba1/3MnO3 with x = 0.0, 1/6, 1/3, ˝, 2/3, 5/6 and

1.0 have been prepared using solid state reaction. The metal-insulator transition (TP) temperatures were determined by using the standard four-point probe resistivity measurement in a temperature range of 30K to 300K. Tp shifted to lower temperatures with the increase of Nd doping. On analyzing the data by using several theoretical models, it has been concluded that the metallic (ferromagnetic) part of the resistivity (ρ) below TP fits well with the equation ρ = ρ0 + ρ2T2 + ρ4.5T4.5, indicating ρ0 is due to the grain/domain boundary effects. A second term ~ρ2T2 appears might be attributed to electron–electron scattering and second-order electron–magnon scattering term ~ρ4.5T4.5. The magnetoresistance (MR) effects are measured using the four point probe technique. The magnetoresistance defined as MR% = (Ro RH)/RH × 100 was measured at magnetic fields H 1T at 90K, 150K, 250K and 300K. Overall, MR drops slowly when temperature rises. All doping concentration gives small variation range (~8.28% to ~56.53%). The highest MR value of ~56.53 % was measured at 1Tesla, at 100K for sample of x = 1.0. ). At Low Field Magnetoresistance (LFMR), the highest gradient of MR is 125.35% MR/Tesla for sample x=0.0 at temperature 90K. The LFMR decreases prominently with increasing doping amount, while the HFMR is increased.

 

http://journal.masshp.net/wp-content/uploads/Journal/2006/A.%20Huda%2075-80.pdf

 

REFERENCES

[1]. C. Abdullah, S.A.Halim, M.S.Sharmawati, G. Zohra, K.P.Lim, I. Hamadneh,

K.K.Kabashi, M.T.Azman, W.M.M. Yunus and M.M.Mokhsin, (2002);

Effect of Ga and In Substitution for La in La2/3Ca1/3MnO3 perovskite, Proc.

Mal. Sci. & Tech. Con. Symp. A,

[2]. N. Abdelmoula, A. Cheikh-Rouhou and L. Reversat, Structural, magnetic

and magnetoresistive properties of La0.7Sr0.3-xNaxMnO3 manganites, Journal

of Physics: Condensed Matter, 13 (2001)449-458.

[3]. P. G. Radaelli, D. E. Cox, M. Marezio, S.W.Cheong, P. E. Sciffer and A.P.

Ramirez, Phys. Rev. lett. 75, (1995) 4488

[4]. B. Sayani, S. Pal, R. K. Mukherjee, B. K. Chaudhuri, 2004. Development of

pulsed magnetic field and study of magnetotransport properties of K-doped

La1-xCax-yKyMnO3 CMR materials, J. Magn. Magn. Mater.269: 359-371

[5]. M. Ziese, 2000, Spontaneous resistivity anisotropy and band structure of

La0.7Ca0.3MnO3 and Fe3O4 films, Phys. Rev. B 62: 1044

[6]. D.S. Rana, C M Thaker, K R Mavani, D G Kubekar, D C Kundaliya and S K

Malik, 2004, Electronic transport, magnetism and colossal

magnetoresistance of (La0.7-3xTbx)(Ca0.3Sr2x)MnO3 (0.025≤x≤0.125)

compounds, J. Appl. Phys. 95: 4934

[7]. N.F. Mott, Metal-Insulator Transition, Taylor & Francis, London, (1990)

[8]. C. Zener, Interaction between the d-shells in the transition metals. II.

Ferromagnetic compounds of Manganese with perovskite structure. Phys.

Rev. 82, (1951) 403 – 405.

[9]. Saket Asthana, D Bahadur, A K Nigam and S K Malik, Magneto-transport

studies on (Pr1/3Sm2/3)2/3A1/3MnO3 (A= Ca, Sr and Ba) compounds, J/ Phys:

Condens. Matter 16 (2004) 5297 – 5307