The Physical Nature of Resistive Switchings in Mesoscopic Contacts Based on the Complex Oxides of the Transition Metals
A. P. Shapovalov$^{1,2}$, V. P. Bloshchytskii$^{3}$, O. V. Gornostaeva$^{4,5}$, M. V. Zalutskii$^{4,5}$, O. A. Kordyuk$^{2,4}$
$^{1}$V. Bakul Institute for Superhard Materials, NAS of Ukraine, 2 Avtozavods’ka Str., UA-04074 Kyiv, Ukraine
$^{2}$Kyiv Academic University, N.A.S. and M.E.S. of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
$^{3}$Donetsk National Technical University, 2 Shybankov Sqr., UA-85300 Pokrovs’k, Ukraine
$^{4}$G.V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
$^{5}$Vasyl’ Stus Donetsk National University, 21 600-richchya Str., UA-21021 Vinnytsia, Ukraine
Received: 18.07.2017. Download: PDF
A new mechanism of resistive switchings in the mesoscopic heterocontacts formed by a conventional-metal tip with a surface of bulk transition-metal oxide samples with a perovskite structure, which are conductors in their interior, is proposed. Based on the experimental data proving that the near-surface region of doped complex oxides is highly inhomogeneous with non-metallic conductivity, authors assume the presence of spontaneous polarization in it, even in the absence of an external electric field. Turning on the field will lead to a reorientation of mesoscopic electric dipoles in a field direction. In this case, the hysteresis of current–voltage characteristics is a result of the nonlinear coupling between the applied electric field and the electric charge inside the crystal structure. Experimental data are presented indicating that double-valued current–voltage curves are observed in the heterostructures with various perovskite materials.
Key words: mesoscopic structures, complex transition-metal oxides, near-surface region, electric dipoles, hysteresis.
URL: http://mfint.imp.kiev.ua/en/abstract/v39/i08/1005.html
DOI: https://doi.org/10.15407/mfint.39.08.1005
PACS: 62.23.St, 68.47.Gh, 77.80.bg, 77.80.bn, 84.32.Dd
Citation: A. P. Shapovalov, V. P. Bloshchytskii, O. V. Gornostaeva, M. V. Zalutskii, and O. A. Kordyuk, The Physical Nature of Resistive Switchings in Mesoscopic Contacts Based on the Complex Oxides of the Transition Metals, Metallofiz. Noveishie Tekhnol., 39, No. 8: 1005—1016 (2017) (in Russian)