Study of structural effect on Eu-substituted LSMO manganite for high temperature coefficient of resistance

Vadnala, S and Durga Rao, T and Pal, Prem and Asthana, S (2014) Study of structural effect on Eu-substituted LSMO manganite for high temperature coefficient of resistance. Physica B: Condensed Matter, 448. pp. 277-280. ISSN 0921-4526

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Abstract

n this work, Eu substituted La0.7Sr0.3MnO 3 (LSMO) is studied to achieve high temperature coefficient of resistance (TCR). The compounds La0.7-xEuxSr 0.3MnO3 with x=0, 0.1 0.2 and 0.3 are prepared by solid state reaction route and their structural and transport properties are examined by different characterization techniques. The metal-semiconductor/insulator transition temperature (TMI) decreases from 390 K (for x=0) to 240 K (for x=0.3) with decrease in average ionic radius 〈rA〉 of A-site. The maximum TCR percentage of La0.7-xEuxSr 0.3MnO3 compound is found to be increased for x=0.2 (1.9%) and for x=0.3 (3.36%) compared to its parent compound La0.7Sr 0.3MnO3 (1.1%). The substitution of Eu increases the lattice distortion, which enhances the TCR value from 1.1% to 3.36%. The robustness of distortion increases with decreasing 〈rA〉 which is well correlated with the high magneto-resistance, and high TCR findings.

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IITH Creators:

IITH Creators	ORCiD
Pal, Prem	UNSPECIFIED
Asthana, Saket	http://orcid.org/0000-0002-6420-3304

Item Type:

Article

Additional Information:

The authors are grateful to the financial support received from the University Grants Commission through UPE-Phase-II project (UH/UGC/UPE Phase-2/Interface studies/Research projects/R-4) and the School of Engineering Sciences and Technology (SEST) at the University of Hyderabad. The help extended by Mr. Mahesh, Mr. Ajeet Kumar, of CCG at DMRL Hyderabad in carrying out the piezoelectric measurements is greatly appreciated.

Uncontrolled Keywords:

Magnetoresistance; Manganite; Polaron hopping energy; TCR

Subjects:

Physics

Divisions:

Department of Physics

Depositing User:

Team Library

Date Deposited:

28 Nov 2014 09:02

Last Modified:

29 Aug 2017 09:51