Non-Ohmic Variable-Range Hopping and Resistive Switching in SrTiO3 Domain Walls
| Autor: | H. J. Harsan Ma, James F. Scott |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Physical Review Letters. 124 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.124.146601 |
| Popis: | We report observation of electric field driven conductivity with negative differential conductance and resistive switching in insulating ${\mathrm{SrTiO}}_{3}$ samples over a wide range of applied voltages at low temperatures. The observed current follows $I={I}_{0}\mathrm{exp}[\ensuremath{-}{({E}^{*}/E)}^{1/2}]$ at large applied electric field, corresponding to variable range hopping conduction with a Coulomb gap in domain walls. Our data are sufficient to discriminate unambiguously between Shklovskii and Mott hopping via their different electric field exponent. Under some conditions space-charge-limited currents are observed, and the charge mobility limit is determined to be in the range of 17 and $210\text{ }\text{ }{\mathrm{cm}}^{2}/\mathrm{Vs}$. |
| Databáze: | OpenAIRE |
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