Magneto-Optics of Nd_0.7Sr_0.3MnO_3-δ Thin Films
Abstract
We have measured the far-infrared (25-250 cm-1) and near-infrared/ visible (5400-25,000 cm-1) transmission of thin films of Nd_0.7Sr_0.3MnO_3-δ on Al_2O3 substrates at temperatures from 15-300 K and magnetic fields from 0 to 9 T. For a 130 nm thick film, the transmission increases above 12,000 cm-1 by nearly 20% and decreases below this frequency by up to 60% as the temperature is lowered from 180 to 15 K. Similar spectral changes, of approximately half this amplitude, are seen at 180 K as the magnetic field is increased from 0 to 9 T. Optical conductivity curves are derived by fitting the transmittance curves with a Lorentzian dielectric function. The real part of the optical conductivity shows a gap-like feature near 10,000 cm-1 which shifts to lower frequency as the temperature is lowered or the magnetic field is increased.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 1996
- Bibcode:
- 1996APS..MAR..O909K