Electric-Pulse-driven Electronic Phase Separation, Insulator-Metal Transition, and Possible Superconductivity in a Mott Insulator
| Autor: | Benoit Corraze, Cristian Vaju, Vincent Dubost, Dimitri Roditchev, Tristan Cren, Olivier Chauvet, Daniel Braithwaite, Laurent Cario, Etienne Janod |
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| Rok vydání: | 2008 |
| Předmět: |
Condensed Matter::Quantum Gases
Superconductivity Materials science Colossal magnetoresistance Condensed matter physics Mechanical Engineering Mott insulator Insulator (electricity) 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Mott transition Mechanics of Materials Electrical resistivity and conductivity 0103 physical sciences Condensed Matter::Strongly Correlated Electrons General Materials Science Electric current Metal–insulator transition 010306 general physics 0210 nano-technology |
| Zdroj: | Advanced Materials. 20:2760-2765 |
| ISSN: | 1521-4095 0935-9648 |
| Popis: | Metal-insulator transitions (MIT) belong to a class of fascinating physical phenomena, which includes superconductivity, and colossal magnetoresistance (CMR), that are associated with drastic modifications of electrical resistance. In transition metal compounds, MIT are often related to the presence of strong electronic correlations that drive the system into a Mott insulator state. In these systems the MIT is usually tuned by electron doping or by applying an external pressure. However, it was noted recently that a Mott insulator should also be sensitive to other external perturbations such as an electric field. We report here the first experimental evidence of a non-volatile electric-pulse-induced insulator-to-metal transition and possible superconductivity in the Mott insulator GaTa4Se8. Our Scanning Tunneling Microscopy experiments show that this unconventional response of the system to short electric pulses arises from a nanometer scale Electronic Phase Separation (EPS) generated in the bulk material. |
| Databáze: | OpenAIRE |
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