Srivastava, Manoj K. and Kaur, Amarjeet and Singh, H. K. (2013) Impact of Quenched Disorder on Magnetotransport Properties in Nd0.55-xSmxSr0.45MnO3 Thin Films. Solid State Physics: Proceedings Of The 55th DAE Solid State Physics Symposium 2010, PTS A and B, 1512. pp. 722-723. ISSN 0094-243X

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Abstract

The effect of size mismatch induced quenched disorder on magnetotransport properties has been studied in polycrystalline Nd0.55-xSmxSr0.45MnO3 (x=0.00, 0.05, 0.15, 0.25, 0.35, and 0.45) thin films (thickness similar to 300nm) prepared on LaAlO3 [LAO (001)] single crystal substrates by chemical spray pyrolysis. X-ray diffraction (XRD) data reveals that the films have oriented growth along out-of-plane (OP) direction. The OP lattice parameter decreases on substitution of Sm3+ ions for Nd3+. The insulator-metal/PM-FM transition temperatures (T-IM/T-C) for all the compositions decrease systematically and the transitions get sharpened as the variance sigma(2) that measures the quenched disorder due to size mismatch. The in-plane and out-of-plane low field magnetoresistance (LFMR) are enhanced appreciably with increasing quenched disorder (sigma(2)). The variation in peak magnetoresistance (maximum MR around TIM) with sigma(2) shows drastic change above sigma(2)= 0.008469 angstrom(2) (x=0.25). The small polaron activation energy also increases appreciably. The observed effects have been explained in terms of the size disorder induced carrier localization.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier.
Subjects:	Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	09 Nov 2021 09:44
Last Modified:	09 Nov 2021 09:44
URI:	http://npl.csircentral.net/id/eprint/3182

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