Giant reversible nanoscale piezoresistance at room temperature in Sr₂IrO₄ thin films
Layered iridates have been the subject of intense scrutiny on account of their unusually strong spin-orbit coupling, which opens up a narrow bandgap in a material that would otherwise be a metal. This insulating state is very sensitive to external perturbations. Here, we show that vertical compressi...
| Autores: | , , , , , , , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2015 |
| País: | España |
| Institución: | Universitat Autònoma de Barcelona |
| Repositorio: | Dipòsit Digital de Documents de la UAB |
| Idioma: | inglés |
| OAI Identifier: | oai:ddd.uab.cat:212911 |
| Acceso en línea: | https://ddd.uab.cat/record/212911 https://dx.doi.org/urn:doi:10.1039/c4nr06954d |
| Access Level: | acceso abierto |
| Palabra clave: | Anisotropic deformation External perturbations Insulating state Orders of magnitude Piezoresistance Room temperature Room-temperature resistivity Spin-orbit couplings |
| Sumario: | Layered iridates have been the subject of intense scrutiny on account of their unusually strong spin-orbit coupling, which opens up a narrow bandgap in a material that would otherwise be a metal. This insulating state is very sensitive to external perturbations. Here, we show that vertical compression at the nanoscale, delivered using the tip of a standard scanning probe microscope, is capable of inducing a five orders of magnitude change in the room temperature resistivity of Sr₂IrO₄. The extreme sensitivity of the electronic structure to anisotropic deformations opens up a new angle of interest on this material, with the giant and fully reversible perpendicular piezoresistance rendering iridates as promising materials for room temperature piezotronic devices. |
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