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

Arnab Roy; P. S.Anil Kumar

doi:10.1016/j.jmmm.2013.02.013

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

Arnab Roy, P. S.Anil Kumar

Indian Institute of Science Bangalore

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

The reentrant low temperature phase of the perovskite manganite LaMnO _3+δ (δ=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 (∼10^-9 s) compared to a canonical spin glass.

Original language	English
Pages (from-to)	79-82
Number of pages	4
Journal	Journal of Magnetism and Magnetic Materials
Volume	337-338
DOIs	https://doi.org/10.1016/j.jmmm.2013.02.013
State	Published - Jul 2013
Externally published	Yes

Bibliographical note

Funding Information:
One of the authors (A.R.) wishes to thank CSIR, India for financial support.

Funding

One of the authors (A.R.) wishes to thank CSIR, India for financial support.

Funders	Funder number
Council of Scientific and Industrial Research, India

Access to Document

10.1016/j.jmmm.2013.02.013

Cite this

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title = "Evidence of collective relaxation behavior in the reentrant phase of oxygen-rich LaMnO3",

abstract = "The reentrant low temperature phase of the perovskite manganite LaMnO 3+δ (δ=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 (∼10-9 s) compared to a canonical spin glass.",

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AB - The reentrant low temperature phase of the perovskite manganite LaMnO 3+δ (δ=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 (∼10-9 s) compared to a canonical spin glass.

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