GROWTH OF SUPERCONDUCTING Y-BA-CU-O FILMS ON SPINEL AND GARNET

Spinel and garnet single crystals of low dielectric constants and loss tangents have been investigated as possible substrate materials for t he growth of the Y-Ba-Cu-O superconducting films. In addition to their desirable dielectric properties, these materials are chemically compa tible with silicon and compound semiconductors and can be used as the interface materials for the integration of cuprate superconducting fil ms with semiconducting devices. The Y-Ba-Cu-O films grown on (001) MgA l2O4 and (001) Y3Al5O12 from a co-evaporation deposition with a subseq uent wet anneal exhibit superconductivity with a transition temperatur e T(c)(R=0) of 57 and 74 K, respectively, while strongly (001) texture d YBa2Cu3O7-x films from the in situ laser deposition grown on (001) M gAl2O4 and (001) Y3Al5O12 show superconducting transition temperatures T(c)(R=0) of 77 and 87 K, respectively. Our work demonstrates that th ese two materials are viable substrates for the Y-Ba-Cu-O thin films i n high frequency device applications.