Metal-Insulator Transition Induced by Spin Reorientation in Fe7Se8 Grain Boundaries
| Autor: | T. G. Baluyan, Graeme R. Blake, Jiquan Wu, Jiancun Rao, Robert A. de Groot, Thomas Palstra, Guowei Li, Alla A. Novakova, Petra Rudolf, Baomin Zhang |
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| Přispěvatelé: | Solid State Materials for Electronics, Surfaces and Thin Films, Zernike Institute for Advanced Materials |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Magnetism
ELECTRICAL-TRANSPORT 02 engineering and technology Crystal structure FILMS 01 natural sciences Inorganic Chemistry Magnetization X-ray photoelectron spectroscopy MAGNETIC-PROPERTIES Spectroscopy of Solids and Interfaces 0103 physical sciences XPS PHASE-CHANGE MATERIALS Physical and Theoretical Chemistry Metal–insulator transition 010306 general physics Theoretical Chemistry Electronic Structure of Materials TEMPERATURE Condensed matter physics Spins Chemistry IRON POLYCRYSTALLINE GRAPHENE 021001 nanoscience & nanotechnology Electron localization function CHEMICAL-VAPOR-DEPOSITION SIZE Grain boundary 0210 nano-technology |
| Zdroj: | Inorganic chemistry, 55(24), 12912-12922. American Chemical Society Inorganic Chemistry, 55(24), 12912-12922. AMER CHEMICAL SOC Inorganic Chemistry, 25, 12912-12922 Inorganic Chemistry, 25, 24, pp. 12912-12922 |
| ISSN: | 0020-1669 |
| DOI: | 10.1021/acs.inorgchem.6b02257 |
| Popis: | Contains fulltext : 166243.pdf (Publisher’s version ) (Closed access) Fe7Se8 exists as a hexagonal NiAs-like crystal structure with a large number of ordered intrinsic vacancies. It is an ideal candidate for studying the effect of defects on properties such as magnetism and electrical transport. In this work, highly crystalline Fe7Se8 with the 3c crystal structure was synthesized by a solid-state reaction. Sharp changes in the magnetization at 100 K confirm a rotation of the spins from the ab plane to the c axis with decreasing temperature. We observe an interesting metal–insulator transition at the same temperature as the spin-direction changes. We propose that locked spins in the grain boundaries induce electron localization and result in the metal–insulator transition. Electron localization is confirmed by X-ray photoelectron spectroscopy of the Fe 2p peaks, which exhibit two characteristic satellite peaks. This mechanism is also verified by comparing it with the properties of the 4c-Fe7Se8 crystal structure. |
| Databáze: | OpenAIRE |
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