Effect of cobalt substitution on magnetic and transport properties of Nd0·5Sr0·5Mn1−x Co x O3 (x = 0·1, 0·3 and 0·5)

Asthana, Saket (2011) Effect of cobalt substitution on magnetic and transport properties of Nd0·5Sr0·5Mn1−x Co x O3 (x = 0·1, 0·3 and 0·5). Bulletin of Materials Science, 34 (2). pp. 279-282. ISSN 0250-4707

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The magnetic and transport properties of the compounds Nd0·5Sr0·5Mn 1−x Co x O3 (x = 0·1, 0·3 and 0·5), synthesized by citrate–gel route have been investigated. The spin transition in cobaltates at low temperatures affects the magnetic as well as transport properties. The irreversibility behaviour between the zero-field cooled (ZFC) and field cooled (FC) magnetization as a function of temperature becomes stronger with increasing Co content. This is understood on the basis of glassy behaviour, which becomes more robust with increasing Co substitution. The non-saturating M–H behaviour indicates strong magnetic inhomogeneities which may cause the magnetic phase separation at the nanoscopic length scale. The double exchange interaction is stronger between Mn3 + –O2 − –Mn4 +  as compared to Co3 + –O2 − –Co4 +  pairs. Co-substitution suppresses the double exchange which will lead to cluster/spin glass like behaviour as well as semiconducting features due to localization of charge carriers (mobile eg electrons).

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IITH Creators:
IITH CreatorsORCiD
Asthana, Sakethttp://orcid.org/0000-0002-6420-3304
Item Type: Article
Additional Information: The author is thankful to Prof. Joonghoe Dho and Dr Cedric Desplanches for the discussion as well as suggestions.
Uncontrolled Keywords: Manganites; cobaltates; magnetic properties; spin state transition; charge order
Subjects: Physics > Magnetism
Divisions: Department of Physics
Depositing User: Users 3 not found.
Date Deposited: 18 Sep 2014 08:12
Last Modified: 29 Aug 2017 10:00
URI: http://raiith.iith.ac.in/id/eprint/11
Publisher URL: https://doi.org/10.1007/s12034-011-0079-3
OA policy: http://www.sherpa.ac.uk/romeo/issn/0250-4707/
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