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Time evolution of resistance in response to magnetic field: Evidence of glassy transport in La0.85Sr0.15CoO3

Samal, D and Kundu, R and Dalai, MK and Sekhar, BR and Kumar, Anil PS (2012) Time evolution of resistance in response to magnetic field: Evidence of glassy transport in La0.85Sr0.15CoO3. In: PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, 249 (11). pp. 2190-2193.

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Official URL: http://dx.doi.org/10.1002/pssb.201147551

Abstract

We demonstrate the distinct glassy transport phenomena associated with the phase separated and spin-glass-like phases of La0.85Sr0.15CoO3, prepared under different heat-treatment conditions. The low-temperature annealed (phase-separated) sample, exhibits a small change in resistance, with evolution of time, as compared to the high-temperature annealed (spin glass) one. However, the resistance change as a function of time, in both cases, is well described by a stretched exponential fit, signifying the slow dynamics. Moreover, the ultraviolet spectroscopy study evidences a relatively higher density of states in the vicinity of EF for low-temperature annealed sample and this correctly points to its less semiconducting behavior.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to WILEY-V C H VERLAG GMBH, GERMANY
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Depositing User: Francis Jayakanth
Date Deposited: 31 Dec 2012 05:46
Last Modified: 31 Dec 2012 05:46
URI: http://eprints.iisc.ac.in/id/eprint/45477

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