Deposition of YBCO Thin Films in View of Microwave Applications

In preparation for the future characterization of the microwave properties of pulsed laser deposited high-temperature superconductor YBa
₂
Cu
₃
O
_6+x
(YBCO) thin films, a YBCO growth optimization is performed using different substrate materials that have both a small dielectric constant and a small dielectric loss tangent. At first, the effect of thermal contact between a SrTiO
₃
substrate and the sample holder is investigated by comparing silver paste and a mechanical attaching mask as fixing techniques. Hence, the thermal contact is observed to be a crucial parameter for successful growth, while the effect of lattice mismatch when using, e.g., MgO, SrLaAlO
₄
, NdGaO
₃
, and (LaAlO
₃
)
_0.3
(Sr
₂
AlTaO
₆
)
_0.7
, is seen to be less important. In addition, the preliminary reflectiontype measurements for a meander-type coplanar stripline YBCO resonator are implemented and a comparison between the calculated and experimentally determined field-dependent frequency values is obtained.