Pseudogap behavior in Pr$_{0.5}$Sr$_{0.5}$MnO$_3$: A photoemission study
| Autor: | Pal, P., Dalai, M. K., Ulfat, I. |
|---|---|
| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Surface Science 605 (2011) 875-877 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.susc.2011.01.031 |
| Popis: | The valence band electronic structure of Pr$_{0.5}$Sr$_{0.5}$MnO$_3$ has been investigated across its paramagnetic metallic (PMM) - ferromagnetic metallic (FMM) - antiferromagnetic insulator (AFMI) transition. Using surface sensitive high resolution photoemission we have conclusively demonstrated the presence of a pseudogap of magnitude 80 meV in the near Fermi level electronic spectrum in the PMM and FMM phases and finite intensity at the Fermi level in the charge ordering (CO)-AFMI phase. The pseudogap behavior is explained in terms of the strong electron-phonon interaction and the formation of Jahn Teller (JT) polarons, indicating the charge localizations. The finite intensity at the Fermi level in the insulating phase showed a lack of charge ordering in the surface of the Pr$_{0.5}$Sr$_{0.5}$MnO$_3$ samples. Comment: 4 pages, 3 figures |
| Databáze: | arXiv |
| Externí odkaz: |
|