Regensburg 2000 – scientific programme
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AM: Magnetismus
AM 14: Magnetowiderstand I: Manganate
AM 14.4: Talk
Wednesday, March 29, 2000, 15:00–15:15, H10
Optical conductivity of Pr0.65Ca0.28Sr0.07MnO3 — •J. Sichelschmidt1,2, F. Mayr1, A. Loidl1, and A. A. Mukhin3 — 1Experimentalphysik V,Universität Augsburg, D-86135 Augsburg — 2Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden — 3General Physics Institute, Russian Academy of Sciences, 105835 Moscow, Russia
We have investigated the optical conductivity of the charge-ordered perovskite Pr0.65Ca0.28Sr0.07MnO3 for frequencies between 5 meV and 6 eV and temperatures between 5 K and 295 K. The results are interpreted in terms of polaronic effects. Below 100 K a broad mid-infrared band appears and indicates enhanced polaron resonance along with a considerable shift of spectral weight from the near-infrared region into the mid-infrared region. Additional phonon modes below the charge ordering temperature TCO=210 K indicate charge order driven lattice distortions.