A Room-Temperature Verwey-type Transition in Iron Oxide,Fe5O6 |
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Authors: | Dr Sergey V Ovsyannikov Dr Maxim Bykov Dr Sergey A Medvedev Dr Pavel G Naumov Dr Anton Jesche Dr Alexander A Tsirlin Dr Elena Bykova Dr Irina Chuvashova Dr Alexander E Karkin Dr Vadim Dyadkin Dr Dmitry Chernyshov Prof Dr Leonid S Dubrovinsky |
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Institution: | 1. Bayerisches Geoinstitut, Universität Bayreuth, Universitätsstrasse 30, 95447 Bayreuth, Germany;2. Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany;3. Experimental Physics VI, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, 86135 Augsburg, Germany;4. M. N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 18 S. Kovalevskaya Str., Yekaterinburg, 620137 Russia;5. Swiss-Norwegian Beamlines at the European Synchrotron Radiation Facility, 38000 Grenoble, France |
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Abstract: | Functional oxides whose physicochemical properties may be reversibly changed at standard conditions are potential candidates for the use in next-generation nanoelectronic devices. To date, vanadium dioxide (VO2) is the only known simple transition-metal oxide that demonstrates a near-room-temperature metal–insulator transition that may be used in such appliances. In this work, we synthesized and investigated the crystals of a novel mixed-valent iron oxide with an unconventional Fe5O6 stoichiometry. Near 275 K, Fe5O6 undergoes a Verwey-type charge-ordering transition that is concurrent with a dimerization in the iron chains and a following formation of new Fe−Fe chemical bonds. This unique feature highlights Fe5O6 as a promising candidate for the use in innovative applications. We established that the minimal Fe−Fe distance in the octahedral chains is a key parameter that determines the type and temperature of charge ordering. This model provides new insights into charge-ordering phenomena in transition-metal oxides in general. |
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Keywords: | Eisenoxide Hohe Drücke Ladungsordnung Übergangsmetalloxide Verwey-Übergang |
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