Giant Magneto-Resistance in Nd_0.7Sr_0.3MnO₃ at Optical Frequencies

1996/02/13 by S. G. Kaplan, Kaplan, S. G., M. Quijada +13
Physics and Astronomy · #Condensed Matter (cond-mat) #FOS: Physical sciences #cond-mat

paper · pdf · doi:10.48550/arxiv.cond-mat/9602075

Latex file (11 pages) + 4 Postscript figures, uuencoded

arxiv created 1996/02/13 · arxiv updated 2009/11/30

Abstract

The optical properties of Nd_0.7Sr_0.3MnO₃ thin films have been studied from 5 meV to 25 meV and from 0.25 eV to 3 eV, at temperatures from 15 K to 300 K and magnetic fields up to 8.9 T. A large transfer of spectral weight from high energy to low energy occurs as the temperature is decreased below 180 K, where the dc resistivity peaks, or as the magnetic field is increased. The optical data are found to be consistent with models that include both the double exchange interaction and the dynamic Jahn-Teller effect on the Mn³⁺ e_g levels.

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