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Microstructural, Electrical-, Magneto-Transport Properties of Grain Size Modulated Nanocrystalline Nd0.67Sr0.33MnO3 CMR Manganites

Published online by Cambridge University Press:  15 March 2011

S. Paul  and
T. K. Nath
S. Paul
Affiliation:
Magnetism and Magnetic Materials Laboratory, Department of Physics and Meteorology Indian Institute of Technology, Kharagpur: 721302, West Bengal, India
T. K. Nath
Affiliation:
Magnetism and Magnetic Materials Laboratory, Department of Physics and Meteorology Indian Institute of Technology, Kharagpur: 721302, West Bengal, India
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Abstract

We have investigated the effect of nanometric grain sizes on Microstructural, electrical-, magneto-transport and magnetic behaviors in nanocrystalline Nd0.67Sr0.33MnO3 CMR manganites. Three nanocrystalline powders of Nd0.67Sr0.33MnO3 were synthesized through chemical route “Pyrophoric Reaction Process” and calcined for 5 hrs at calcinations temperature (TCal = 650°C, 750°C, and 850°C). XRD patterns indicate that all the synthesized powders have pseudo-cubic perovskite structure without any secondary impurity phase. Using Debye Scherrer formula we calculated the crystallites size for three nanocrystalline Nd0.67Sr0.33MnO3 powders (∼ 30, 40, and 54 nm for TCal = 650°C, 750°C, and 850°C respectively). TEM micrographs show that the average particle sizes are in nanometric regime (ψ ∼ 30–50 nm). In AC susceptibility and resistivity measurement we observed that there is an almost constant Curie temperature (TC) has value around 240 K and gradual decrease of metal-insulator transition temperature (TP) (from 200-129 K) with decrease of TCal. The magneto resistance of ultra fine nanoparticles increases with grain sizes. Highest magnetoresistance observed ∼ 24 for Nd0.67Sr0.33MnO3 with TCal = 850°C. Experimental results revels, the effect of nanometric grain sizes has an important impact in magnetic properties and magneto-transport behaviors.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1118: Symposium K – Magnetic Nanostructures by Design , 2008 , 1118-K05-03
Copyright
Copyright © Materials Research Society 2009

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References

REFERENCES

[1] Helmolt, R von, Wecker, J., Holzafel, B., Schultz, L., and Samwer, K., Phys. Rev. Lett. 71, 2331 (1993)Google Scholar
[2] Colossal Magnetoresistance, Charge Ordering and Related Properties of Manganese Oxides, edited by Rao, C. N. and Baveau, B. (World Scientific, Singapore, 1998)Google Scholar
[3] Okuda, T., Asamitsu, A., Tomioka, Y., Kimura, T., Taguchi, Y., and Tokura, Y., Phys. Rev. Lett. 81 (1998) 3203 Google Scholar
[4] Biju, V. and Khadar, M. Abdul, Mater. Sci. Eng. A 814, 304–306 (2001)Google Scholar
[5] Mahendriran, R., Tewari, S. K., Raychaudhury, A. K., Ramakrishnan, T. V., Mahesh, R., Rangavittal, N., and Rao, C. N. R., Phys. Rev. B 53, 3348 (1996)Google Scholar
[6] Hwang, H. Y., Cheong, S -W., Radaelli, P. G., Marezio, M., and Batlogg, B., Phys. Rev. Lett. 75 914 (1995)Google Scholar
[7] Zener, C., Phys. Rev. 82, 403 (1951)Google Scholar
[8] Mori, S., Chen, C. H., and Cheong, S. W., Phys. Rev. Lett. 81, 5144 (1998)Google Scholar
[9] Mahesh, R., Mahendriran, R., Raychaudhury, A. K., and Rao, C. N. R., Appl. Phys. Lett. 68, 2291 (1996)Google Scholar
[10] Dey, P. and Nath, T. K., Journal of Appl. Phys. 98, 014306 (2006)Google Scholar
[11] Roy, B., Poddar, A., and Das, S., Journal of Appl. Phys. 100, 104318 (2006)Google Scholar
[12] Mukhopadhay, S. and Das, I., Phys. Rev. B 76, 094424 (2007)Google Scholar
[13] Dey, P. and Nath, T. K., Physical Review B 73, 1 (2006)Google Scholar