| SCANNING TUNNELING SPECTRA AND LOW ENERGY ION SCATTERING STUDIES OF THE VERWEY TRANSITION IN MBE Fe3O4 (100) THIN FILM |
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N.-T.H. Kim-Ngan, W. Soszka Institute of Physics, Pedagogical University Podchorążych 2, 30-084 Kraków, Poland and M. Hietschold Institute of Physics, Chemnitz University of Technology, 09107 Chemnitz, Germany |
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| Received: December 27, 2000 |
| The (100) surface of magnetite Fe3O4 thin film was studied by a UHV low-temperature scanning tunneling microscope and by an ion scattering spectroscopy. The tunneling spectra revealed a widening of the gap with decreasing temperature, which may be related to the metal-insulator phase transition in this material. A strong effect of this phase transition on ion scattering from such a surface was observed. The temperature dependence of the scattered ion yield, R+(T), revealed two minima at around 100 K and at 125 K under Ne+ bombardment with the primary energy up to 6 keV. The disappearance of the high-temperature minimum at a bombarding energy of 6.5 keV gave a further evidence for the ion velocity dependence of the character of the R+(T) curve, which has been first observed for a MBE Fe3O4 (111) film surface. |
| DOI: 10.12693/APhysPolA.99.267 PACS numbers: 61.16.Ch, 61.18.Bn, 71.30.+h |