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Dielectric properties of substrates for deposition of high-T c thin films up to 40 GHz

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2 Author(s)
Konopka, Janusz ; Inst. Fizyki PAN, Warszawa, Poland ; Wolff, I.

Dielectric properties of CaNdAlO4, LaAlO3, SrLaAlO4, SrLaGa3O7, and NdGaO3 monocrystals, prospective substrate materials for the deposition of thin films of high-temperature superconductors, were measured with high accuracy at frequencies up to 40 GHz in the temperature range 10 to 300 K. Most materials exhibit uniaxial anisotropy with ε'r ranging from 8.88 (SrLaGa3O7 along optical c-axis) to 24.18 (LaAlO3). A decrease of ε'r with temperature decrease was observed in all materials CaNdAlO4 (perpendicular to c-axis) where ε'r increases. Microwave losses in LaAlO3, SrLaAlO4 and SrLaGa3O7 decrease with temperature while CaNdAlO4 and NaGaO3 pronounced loss increase was found at temperatures below 100 K. The authors suggest that in the latter materials at lower temperatures, neodymium ions become magnetically ordered and are responsible for the observed effects

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:40 ,  Issue: 12 )

Date of Publication:

Dec 1992

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