Pseudo-gap at the Fermi level inK3C60observed by photoemission and inverse photoemission
| Autor: | T. Takahashi, S. Suzuki, T. Morikawa, H. Katayama-Yoshida, S. Hasegawa, H. Inokuchi, K. Seki, K. Kikuchi, K. Ikemoto, Y. Achiba |
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| Rok vydání: | 1992 |
| Předmět: |
Physics
Condensed matter physics Band gap Doping Fermi level Inverse photoemission spectroscopy General Physics and Astronomy Inverse Angle-resolved photoemission spectroscopy Electronic structure Condensed Matter::Materials Science symbols.namesake Condensed Matter::Superconductivity symbols Condensed Matter::Strongly Correlated Electrons Quasi Fermi level |
| Zdroj: | Physical Review Letters. 68:1232-1235 |
| ISSN: | 0031-9007 |
| Popis: | Photoemission and inverse photoemission spectroscopy has been used on ${\mathrm{C}}_{60}$ and ${\mathrm{K}}_{3}$${\mathrm{C}}_{60}$ to study the change of the electronic structure upon alkali doping and its relation to the occurrence of superconductivity. The experimental results show that alkali doping does not lead to a rigid filling of the lowest unoccupied molecular-orbital band by the doped electrons but causes a transfer of electronic states from that band to an additional band produced in the band gap. A comparison of the photoemission and inverse photoemission spectra indicates that a pseudo-gap of about 0.5 eV opens at the Fermi level in ${\mathrm{K}}_{3}$${\mathrm{C}}_{60}$. Possible origins for the pseudo-gap and its relation to superconductivity are discussed. |
| Databáze: | OpenAIRE |
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