title: Non-linear conduction due to depinning of charge order domains in Fe3O2BO3.
abstract: The oxyborate Fe3O2BO3presents 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 Fe3O2BO3a DC voltage above a temperature dependent threshold, a high current is liberated in this material. We study the conduction in single crystals of Fe3O2BO3with 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 VT2that 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.
authors.affiliation: Departamento de Física, IGCE-Universidade Estadual Paulista UNESP-C.P. 178, 13500-970, Rio Claro-SP, Brazil.
authors.forename: E C
authors.initials: EC
authors.lastname: Dos Santos
authors.forename: E F
authors.initials: EF
authors.lastname: da Silva
authors.forename: J C
authors.initials: JC
authors.lastname: Fernandes
authors.forename: L
authors.initials: L
authors.lastname: Ghivelder
authors.forename: D C
authors.initials: DC
authors.lastname: Freitas
authors.forename: M A
authors.initials: MA
authors.lastname: Continentino
authors.forename: L
authors.initials: L
authors.lastname: Walmsley