Nayak, J. ; Maniraj, M. ; Rai, Abhishek ; Singh, Sanjay ; Rajput, Parasmani ; Gloskovskii, A. ; Zegenhagen, J. ; Schlagel, D. L. ; Lograsso, T. A. ; Horn, K. ; Barman, S. R. (2012) Bulk electronic structure of quasicrystals Physical Review Letters, 109 (21). 216403_1-216403_5. ISSN 0031-9007
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Official URL: http://prl.aps.org/abstract/PRL/v109/i21/e216403
Related URL: http://dx.doi.org/10.1103/PhysRevLett.109.216403
Abstract
We use hard x-ray photoemission to resolve a controversial issue regarding the mechanism for the formation of quasicrystalline solids, i.e., the existence of a pseudogap at the Fermi level. Our data from icosahedral fivefold Al-Pd-Mn and Al-Cu-Fe quasicrystals demonstrate the presence of a pseudogap, which is not observed in surface sensitive low energy photoemission because the spectrum is affected by a metallic phase near the surface. In contrast to Al-Pd-Mn, we find that in Al-Cu-Fe the pseudogap is fully formed; i.e., the density of states reaches zero at EF indicating that it is close to the metal-insulator phase boundary.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Physical Society. |
| ID Code: | 96419 |
| Deposited On: | 19 Dec 2012 05:44 |
| Last Modified: | 19 Dec 2012 05:45 |
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