Metal-Insulator and Structural Phase Transition Observed by ESR Spectroscopy and X-Ray Diffraction inKC60
| Autor: | Clérac R, Alain Pénicaud, Roger Moret, Claude Coulon, James Hone, Pascale Launois |
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| Rok vydání: | 2001 |
| Předmět: |
Diffraction
Phase transition Materials science Condensed matter physics General Physics and Astronomy Atmospheric temperature range law.invention law X-ray crystallography Condensed Matter::Strongly Correlated Electrons Spectroscopy Electron paramagnetic resonance Superstructure (condensed matter) Electron backscatter diffraction |
| Zdroj: | Physical Review Letters. 86:4346-4349 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.86.4346 |
| Popis: | We have performed electron spin resonance (ESR) spectroscopy and x-ray diffraction experiments at low temperature on KC60 single crystals. ESR data reveal the occurrence of a metal-insulator phase transition at about 50 K. In the same temperature range, we observe the stabilization of a superstructure which doubles the volume of the unit cell. We suggest that displacements of the K atoms and a modulation of the C60 charge may be involved in the mechanism of this phase transition. These results shed new light on the subtle interplay of structure, dimensionality, and electronic properties in the AC60 fullerides. |
| Databáze: | OpenAIRE |
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