Tunneling conduction mechanisms in strontium ferromolybdate ceramics with strontium molybdate dielectric intergrain barriers
- 1. TU Dresden, Solid State Electronics Laboratory, 01062 Dresden, Germany
- 2. SSPA "Scientific-Practical Materials Research Centre of NAS of Belarus", Cryogenic research division, 220072 Minsk, Belarus & National University of Science and Technology MISiS, 119049, Moscow, Russia
- 3. SSPA "Scientific-Practical Materials Research Centre of NAS of Belarus", Cryogenic research division, 220072 Minsk, Belarus
- 4. i3N, Departamento de Física, Universidade de Aveiro, 3810-193, Aveiro, Portugal
Description
This work is a contribution to the understanding of the electrical resistivity in strontium ferromolybdate (Sr2FeMoO6-δ, SFMO) ceramics. It demonstrates that an appropriate thermal treatment leads to the formation of dielectric SrMoO4 shells at the surface of SFMO nanograins. In samples without SrMoO4 shells, the sign of the temperature coefficient of resistance changes with increasing temperature from negative at very low temperatures to positive at higher temperatures. Samples exhibiting a negative temperature coefficient contain SrMoO4 shells and demonstrate a behavior of the resistivity that can be described in terms of the fluctuation-induced tunneling model, and near room temperature the conductivity mechanism converts to a variable-range hopping one. The results of this work serve as a starting point for the understanding of the low-field magnetoresistance which is very promising for spintronic device application.
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Suchaneck et al (AAM) - Journal of Alloys and Compounds (2020) 158526.pdf
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- Journal article: 10.1016/j.jallcom.2020.158526 (DOI)