Double-Side Superconducting Mgb2 Films For Microwave And Electronic Applications

Double-side superconducting MgB2 films have been grown on double-side polished sapphire substrates by using hybrid physical-chemical vapor deposition method. The zero resistance temperatures T-C(0)> 37 K and the critical current densities J(C)(5 K,0 T)> 3x10(6) A/cm(2) have been achieved for both sides. In the first 8.73 G MgB2 microstrip resonator fabricated by a double-side film, an unloaded Q value of 3400 at 11 K was obtained corresponding to surface resistance of 1.2 m Omega for the MgB2/Al2O3 interface. By simply using a sapphire substrate with two polished holes, superconducting connection has been achieved for the double-side MgB2 film. The results show potential applications for the superconducting MgB2 films in microwave and electronic devices.