We study and analyze the infrared properties of single crystal MgAl 2 O 4 , an important substrate for high-T c superconducting films, from 10 to 300 cm -1 and 4.2 to 350K. A number of infrared active modes between 20-150 cm -1 have been observed. Some of these modes such as 68, 72, 82, 103 cm -1 are consist with the earlier reports by inelastic neutron scattering method and characterized as transverse acoustic phonon modes. Our measurements also shows extra modes such as 35, 44, 56, 75, 82 cm -1 . The spectra in the far-infrared region has about 60% transmission at 4.2K and opaque above 180cm -1 . The transparent properties of single crystal MgAl 2 O 4 in far infrared region in liquid helium temperature is especially good for HTSC thin films substrate.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering