Non-linear conduction due to depinning of charge order domains in Fe3O2BO3. (10th April 2017)

• Record Type: Journal Article
• Authors: dos Santos, E C; da Silva, E F; Fernandes, J C; Ghivelder, L; Freitas, D C; Continentino, M A; Walmsley, L
• Is Part Of: Journal of physics. Volume 29:Number 20(2017)
• Publication Date: 2017-04-10
• Subjects: charge density wave -- structural phase transition -- non-linear conductance -- charge ordering -- oxyborates -- transition metal oxides; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/aa6960
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: The oxyborate Fe3 O2 BO3 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 Fe3 O2 BO3 a DC voltage above a temperature dependent threshold, a high current is liberated in this material. We study the conduction in single crystals of Fe3 O2 BO3 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 T 2 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.