Resonant photoemission spectroscopy studies of the magnetic phase transitions in Pr(0.5)Sr(0.5)MnO(3)
Artikel i vetenskaplig tidskrift, 2011

The valence band electronic structure of Pr(0.5)Sr(0.5)MnO(3) has been investigated using resonant photoemission spectroscopies across its paramagnetic metallic (PMM)-ferromagnetic metallic (FMM)-antiferromagnetic insulator (AFMI) transition. Using bulk sensitive soft X-ray photoemission, we have confirmed the presence of a gap in the near Fermi level electronic spectrum in the charge ordering (CO) antiferromagnetic insulator (AFMI) phase. The Fermi level exhibits a rigid-band-like shift of about similar to 0.4 eV across the PMM to AFMI transition. Further, we have observed a similar shift of the Pr 4f states to higher binding energies when the sample goes to the CO-AFMI state. The spectral behavior indicates a strong charge carrier localization associated with a charge-density-wave gap related to the CO. On the other hand, the growth of spectral weight at the Fermi level in the PMM state could well be connected to the microscopic phase-separation model. (C) 2011 Elsevier B.V. All rights reserved.



Photoemission spectroscopy


Insulator-metal transitions



colossal magnetoresistance


P. Pal

National Physical Laboratory India

Uppsala universitet

Lunds universitet

M. K. Dalai

National Physical Laboratory India

B. R. Sekhar

Institute of Physics Bhubaneswar

Intikhab Ulfat

Chalmers, Teknisk fysik, Fasta tillståndets fysik

M. Merz

Karlsruhe Institute of Technology, Campus North

P. Nagel

Karlsruhe Institute of Technology, Campus North

S. Schuppler

Karlsruhe Institute of Technology, Campus North

Physica B: Condensed Matter

0921-4526 (ISSN)

Vol. 406 3519-3523