Infrared refractive index of thin YBa[sub 2]Cu[sub 3]O[sub 7] superconducting films
- Massachusetts Inst. of Technology, Cambridge (United States)
- AT and T Bell Lab., Murray Hill, NJ (United States)
This work investigates whether thin-film optics with a constant refractive index can be applied to high-[Tc] superconducting thin films. The reflectance and transmittance of YBa[sub 2]Cu[sub 3]O[sub 7] films on LaAlO[sub 3] substrates are measured using a Fourier-transform infrared spectrometer at wavelengths from 1 to 100 [mu]m at room temperature. The reflectance of these superconducting films at 10K in the wavelength region from 2.5 to 25 [mu]m is measured using a cryogenic reflectance accessory. The film thickness varies from 10 to 200 nm. By modeling the frequency-dependent complex conductivity in the normal and superconducting states and applying electromagnetic-wave theory, the complex refractive index of YBa[sub 2]Cu[sub 3]O[sub 7] films is obtained with a fitting technique. It is found that a thickness-independent refractive index can be applied even to a 25nm film, and average values of the spectral refractive index for film thicknesses between 25 and 200 nm are recommended for engineering applications.
- OSTI ID:
- 6957973
- Journal Information:
- Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States), Journal Name: Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States) Vol. 114:3; ISSN JHTRAO; ISSN 0022-1481
- Country of Publication:
- United States
- Language:
- English
Similar Records
Comparison between LaGaO/sub 3/, LaAlO/sub 3/, KTaO/sub 3/, and SrTiO/sub 3/ substrates for the epitaxial growth of YBa/sub 2/Cu/sub 3/O/sub 7/minus/x/ thin films by a ''BaF/sub 2/ process''
Vapor-deposited superconducting YBa sub 2 Cu sub 3 O sub 7 minus. delta. lines: Effect of thickness and width on morphology
Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTROMAGNETIC RADIATION
FILMS
FOURIER TRANSFORM SPECTROMETERS
INFRARED RADIATION
INFRARED SPECTRA
INFRARED SPECTROMETERS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MEASURING INSTRUMENTS
OPTICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIATIONS
RARE EARTH COMPOUNDS
REFRACTIVITY
SPECTRA
SPECTROMETERS
SUBSTRATES
SUPERCONDUCTING FILMS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES