Giant reversible nanoscale piezoresistance at room temperature in Sr₂IrO₄ thin films
Domingo Marimon, Neus (Institut Català de Nanociència i Nanotecnologia)
López-Mir, Laura (Institut Català de Nanociència i Nanotecnologia)
Paradinas Aranjuelo, Marcos (Institut de Ciència de Materials de Barcelona)
Holy, Vaclav (Charles University. Department of Condensed Matter Physics)
Železný, Jakuv (Institute of Physics ASCR)
Yi, Di (University of California. Department of Materials Science and Engineering)
Suresha, Siriyara J. (Lawrence Berkeley National Laboratory. Materials Sciences Division)
Liu, Jian (University of California. Department of Physics)
Rayan Serrao, Claudy (University of California. Department of Materials Science and Engineering)
Ramesh, Ramamoorthy (University of California. Department of Physics)
Ocal García, Carmen (Institut de Ciència de Materials de Barcelona)
Martí Rovirosa, Xavier (Institut Català de Nanociència i Nanotecnologia)
Catalan, Gustau (Institut Català de Nanociència i Nanotecnologia)

Date:	2015
Abstract:	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.
Grants:	Ministerio de Ciencia e Innovación RYC-2010-06365 European Commission 308023 European Commission 268066 Ministerio de Economía y Competitividad MAT2010-17771 Ministerio de Economía y Competitividad MAT2010-20020 Ministerio de Economía y Competitividad MAT2013-47869-C4-1-P Ministerio de Economía y Competitividad FIS2013-48668-C2-1-P Ministerio de Economía y Competitividad BES-2013-063424 Ministerio de Economía y Competitividad CSD2007-00041 Ministerio de Economía y Competitividad SEV-2013-0295 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-733 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1216
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Anisotropic deformation ; External perturbations ; Insulating state ; Orders of magnitude ; Piezoresistance ; Room temperature ; Room-temperature resistivity ; Spin-orbit couplings
Published in:	Nanoscale, Vol. 7, Issue 8 (February 2015) , p. 3453-3459, ISSN 2040-3372

DOI: 10.1039/c4nr06954d

Postprint 20 p, 898.1 KB

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