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Pseudogap behavior in Pr0.5Sr0.5MnO3: A photoemission study

Prabir Pal ; M. K. Dalai ; Intikhab Ulfat (Institutionen för teknisk fysik, Fasta tillståndets fysik)
Surface Science (0039-6028 ). Vol. 605 (2011), 9-10, p. 875-877.
[Artikel, refereegranskad vetenskaplig]

The valence band electronic structure of Pr0.5Sr0.5MnO3 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 UT) 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 Pr0.5Sr0.5MnO3 samples.

Nyckelord: Electronic structure, Photoemission, Colossal magnetoresistance



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Denna post skapades 2011-03-07. Senast ändrad 2014-03-24.
CPL Pubid: 137672

 

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Institutionen för teknisk fysik, Fasta tillståndets fysik (2005-2015)

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