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Effect of paramagnetic impurities on frequency of sapphire-loaded superconducting cavity resonators

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3 Author(s)
S. K. Jones ; Dept. of Phys., Western Australia Univ., Nedlands, WA, USA ; D. G. Blair ; M. J. Buckingham

Dielectric loaded microwave cavities show great promise as high Q, highly stable frequency determining elements in microwave oscillators. The frequency of a sapphire loaded superconducting cavity has a temperature dependence displaying a turning point at approximately 6 K. The authors show how this phenomenon can be explained in terms of the superconducting surface reactance and a low level of paramagnetic ion impurity in the sapphire.<>

Published in:

Electronics Letters  (Volume:24 ,  Issue: 6 )