Publications by authors named "Wolfgang Speier"
Article Synopsis
- Researchers have uncovered that deoxidized SrTiO becomes metallic and superconducting at very low oxygen vacancy levels, challenging long-standing assumptions.
- Detailed studies show that during thermal reduction, oxygen is lost at extremely low concentrations, leading to the formation of filaments along dislocation networks in the material.
- The findings suggest a rethink of superconductivity models in self-doped SrTiO, proposing that the material behaves as a nano-composite with both insulating and metallic characteristics, facilitating polaronic coupling.
The great variability in the electrical properties of multinary oxide materials, ranging from insulating, through semiconducting to metallic behaviour, has given rise to the idea of modulating the electronic properties on a nanometre scale for high-density electronic memory devices. A particularly promising aspect seems to be the ability of perovskites to provide bistable switching of the conductance between non-metallic and metallic behaviour by the application of an appropriate electric field. Here we demonstrate that the switching behaviour is an intrinsic feature of naturally occurring dislocations in single crystals of a prototypical ternary oxide, SrTiO(3).
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