Title :
Voltage tunable capacitors using high temperature superconductors and ferroelectrics
Author :
Huey-Daw Wu ; Zhihang Zhang ; Barnes, F. ; Jackson, C.M. ; Kain, A. ; Cuchiaro, J.D.
Author_Institution :
Dept. of Electr. & Comput. Eng., Colorado Univ., Boulder, CO, USA
Abstract :
In this paper we report the construction of both slot capacitors on bulk substrate and thin film interdigital capacitors using YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// (YBCO) and Ba/sub x/Sr/sub 1-x/TiO/sub 3/. Slot capacitors made on bulk Ba/sub x/Sr/sub 1-x/TiO/sub 3/ (BST) yielded variations in capacitance of more than 6 to 1 at 86 K with a peak electric field strength of 25 kV/cm. With a metal organic deposition (MOD) grown Ba/sub x/Sr/sub 1-x/TiO/sub 3/ 300-nm overcoat on a YBCO thin film, an interdigital capacitor on LaAlO/sub 3/ substrate yielded an approximate tuning range of 10% for peak field of 66 kV/cm over temperatures ranging from 50 K to 120 K.<>
Keywords :
barium compounds; capacitors; ferroelectric devices; high-temperature superconductors; strontium compounds; superconducting devices; thin film capacitors; tuning; yttrium compounds; 50 to 120 K; 86 K; BST overcoat; Ba/sub x/Sr/sub 1-x/TiO/sub 3/; BaSrTiO/sub 3/; LaAlO/sub 3/; LaAlO/sub 3/ substrate; YBCO thin film; YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta//; YBa/sub 2/Cu/sub 3/O/sub 7/; bulk substrate; capacitance; electric field strength; ferroelectrics; high temperature superconductors; metal organic deposition; slot capacitors; thin film interdigital capacitors; tuning range; voltage tunable capacitors; Binary search trees; Capacitance; Capacitors; High temperature superconductors; Sputtering; Strontium; Substrates; Superconducting thin films; Voltage; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
