Evidence of collective relaxation behavior in the reentrant phase of oxygen-rich LaMnO3

Roy, Arnab and Kumar, Anil PS (2013) Evidence of collective relaxation behavior in the reentrant phase of oxygen-rich LaMnO3. In: Journal of Magnetism and Magnetic Materials, 337-38 . pp. 79-82.

PDF Jou_Mag_Mag_Mat_337_79_2013.pdf - Published Version Restricted to Registered users only Download (479kB) | Request a copy

Abstract

The reentrant low temperature phase of the perovskite manganite LaMnO3+delta (delta=0.22) has been investigated with ac susceptibility and dc magnetization studies. A critical examination of the memory effects in ac susceptibility leads us to the conclusion that the slow dynamics in the system is a consequence of collective relaxation processes resulting from interactions between ferromagnetic clusters, whose presence was indicated in earlier studies. Here, we postulate that the collective behavior is due to the existence of long-range (dipolar) interactions between the large ferromagnetic `superspins'. This is also confirmed by an abnormally large microscopic spin-flip time (similar to 10(-9) s) compared to a canonical spin glass. (C) 2013 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	Journal of Magnetism and Magnetic Materials
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Slow Dynamics; Ferromagnetic Cluster; Superspin Flass; de Almeida-Thouless
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	30 May 2013 11:01
Last Modified:	30 May 2013 11:01
URI:	http://eprints.iisc.ac.in/id/eprint/46511

Actions (login required)

View Item