Ho-Ba-Cu-O Thin Films for Superconductive Electronics

HoBa
₂
Cu
₃
O
_7-δ
(HBCO) thin films were grown by reactive sputtering on SrTiO
₃
(STO), (LaAlO
₃
)
_0.3
(Sr
₂
TaAlO
₆
)
_0.7
(LSAT), and NdGaO
₃
(NGO) substrates for optimization of electrical properties for superconductive electronics. By changing deposition temperature and oxygen partial pressures we were able to obtain films with critical temperatures of 92 K and critical current density of 3 MA/cm
²
. HBCO Josephson junctions were fabricated using focused helium ion beam irradiation that exhibited excellent properties.