| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Enhanced Orbital Degeneracy in Momentum Space for LaOFeAs |
| ZHANG Hai-Jun, XU Gang, DAI Xi, FANG Zhong |
| Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190 |
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| Cite this article: |
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ZHANG Hai-Jun, XU Gang, DAI Xi et al 2009 Chin. Phys. Lett. 26 017401 |
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Abstract The Fermi surfaces (FS) of LaOFeAs (in kz=0 plane) consist of two hole-type circles around Γ point, which do not touch each other, and two electron-type co-centred ellipses around the M point, which are degenerate along the M-X line. By first-principles calculations, here we show that additional degeneracy exists for the two electron-type FS, and the crucial role of F-doping and pressure is to enhance this orbital degeneracy. It is therefore suggested that the inter-orbital fluctuation is important to understand the unconventional superconductivity in these materials.
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| Keywords:
74.70.-b
74.25.Jb
74.25.Ha
71.20.-b
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Received: 04 September 2008
Published: 24 December 2008
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| PACS: |
74.70.-b
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(Superconducting materials other than cuprates)
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74.25.Jb
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(Electronic structure (photoemission, etc.))
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74.25.Ha
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(Magnetic properties including vortex structures and related phenomena)
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71.20.-b
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(Electron density of states and band structure of crystalline solids)
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