dc.contributor.author | SHVETS, IGOR | |
dc.contributor.author | LEE, SUNGBAE | |
dc.contributor.author | FURSINA, ALEXANDRA | |
dc.contributor.author | MAYO, JOHN T | |
dc.contributor.author | CAFER, T. YUVUZ | |
dc.contributor.author | COLVIN, VICKI L | |
dc.contributor.author | SOFIN, RGS | |
dc.contributor.author | NATELSON, DOUGLAS | |
dc.date.accessioned | 2011-05-20T16:09:27Z | |
dc.date.available | 2011-05-20T16:09:27Z | |
dc.date.issued | 2008-02 | |
dc.date.submitted | 2008 | en |
dc.identifier.citation | Lee, S.; Fursina, A.; Mayo, J. T.; Yavuz, C. T.; Colvin, V. L.; Sofin, R. G. S.; Shvets, I. V.; Natelson, D., Electrically driven phase transition inmagnetite nanostructurers, NATURE MATERIALS, 7, 2, 2008, 130 - 133 | en |
dc.identifier.other | Y | |
dc.identifier.uri | http://hdl.handle.net/2262/55894 | |
dc.description | PUBLISHED | en |
dc.description.abstract | Magnetite (Fe3O4), an archetypal transition-metal oxide, has been used for thousands of years, from lodestones in primitive compasses(1) to a candidate material for magnetoelectronic devices(2). In 1939, Verwey(3) found that bulk magnetite undergoes a transition at T-V approximate to 120K from a high-temperature 'bad metal' conducting phase to a low-temperature insulating phase. He suggested(4) that high-temperature conduction is through the fluctuating and correlated valences of the octahedral iron atoms, and that the transition is the onset of charge ordering on cooling. The Verwey transition mechanism and the question of charge ordering remain highly controversial(5-11). Here, we show that magnetite nanocrystals and single-crystal thin films exhibit an electrically driven phase transition below the Verwey temperature. The signature of this transition is the onset of sharp conductance switching in high electric fields, hysteretic in voltage. We demonstrate that this transition is not due to local heating, but instead is due to the breakdown of the correlated insulating state when driven out of equilibrium by electrical bias. We anticipate that further studies of this newly observed transition and its low-temperature conducting phase will shed light on how charge ordering and vibrational degrees of freedom determine the ground state of this important compound. | en |
dc.description.sponsorship | This work was supported by the US Department of Energy grant DE-FG02-06ER46337.
DN also acknowledges the David and Lucille Packard Foundation and the Research Corporation. VLC acknowledges
the NSF Center for Biological and Environmental Nanotechnology (EEC-0647452), Office of
Naval Research (N00014-04-1-0003), and the US Environmental Protection Agency Star Program (RD-
83253601-0). CTY acknowledges a Robert A. Welch Foundation (C-1349) graduate fellowship. RGSS and
IVS acknowledge the Science Foundation Ireland grant 06/IN.1/I91. | en |
dc.format.extent | 130 | en |
dc.format.extent | 133 | en |
dc.language.iso | en | en |
dc.publisher | NATURE PUBLISHING GROUP | en |
dc.relation.ispartofseries | NATURE MATERIALS; | |
dc.relation.ispartofseries | 7; | |
dc.relation.ispartofseries | 2; | |
dc.rights | Y | en |
dc.subject | verwey transition | en |
dc.subject | thermal decomposition | en |
dc.subject | conductivity | en |
dc.subject | nanocrystals | en |
dc.subject | physics | en |
dc.subject | oxides | en |
dc.subject | point | en |
dc.subject | Atomic, molecular and chemical physics | en |
dc.title | Electrically driven phase transition inmagnetite nanostructurers | en |
dc.type | Journal Article | en |
dc.type.supercollection | scholarly_publications | en |
dc.type.supercollection | refereed_publications | en |
dc.identifier.peoplefinderurl | http://people.tcd.ie/ivchvets | |
dc.identifier.rssinternalid | 55207 | |
dc.identifier.rssuri | http://dx.doi.org/10.1038/nmat2084 | en |