Non-linear conduction due to depinning of charge order domains in FeOBO.

J Phys Condens Matter

Departamento de Física, IGCE-Universidade Estadual Paulista UNESP-C.P. 178, 13500-970, Rio Claro-SP, Brazil.

Published: May 2017

The oxyborate FeOBO 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 FeOBO a DC voltage above a temperature dependent threshold, a high current is liberated in this material. We study the conduction in single crystals of FeOBO 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 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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http://dx.doi.org/10.1088/1361-648X/aa6960DOI Listing

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