Non-linear conduction due to depinning of charge order domains in Fe3O2BO3
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2017-04-10
Autores
Dos Santos, E. C. [UNESP]
Da Silva, E. F. [UNESP]
Fernandes, J. C.
Ghivelder, L.
Freitas, D. C.
Continentino, M. A.
Walmsley, L. [UNESP]
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Resumo
The oxyborate Fe3O2BO3 presents a charge density wave (CDW) transition close to room temperature. As we show here, this is associated with a well defined anomaly in the specific heat. Below this transition, when applying in a single crystal of Fe3O2BO3 a DC voltage above a temperature dependent threshold, a high current is liberated in this material. We study the conduction in single crystals of Fe3O2BO3 with voltage applied parallel and perpendicular to the crystallographic c axis direction. The observed currents are attributed to the depinning of charge ordered domains above a threshold voltage V T2 that gives rise to a collective conduction due to coherent domains. Compliance limited DC data shows that above a lower threshold voltage depinning is smooth and follows a power law scaling. Similar depinning with power law scaling is also revealed in the AC conductivity.
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charge density wave, charge ordering, non-linear conductance, oxyborates, structural phase transition, transition metal oxides
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Journal of Physics Condensed Matter, v. 29, n. 20, 2017.