A low noise high-temperature superconducting quantum interference device

Thesis/Dissertation · Fri Dec 31 04:00:00 EST 1993

OSTI ID:121342

Berezin, A B

Superconducting quantum interferences devices (SQUIDs) are useful for a number of applications such as magnetometers, high speed samplers, and RF amplifiers. In some applications, the advantage of a superconducting system is not sufficient to justify 4.2 K operation. However, a high T{sub c} implementation may be attractive. These active circuits demand Josephson junctions and other structures with tunable, well-understood properties. We have developed a process to fabricate step edge grain boundary junctions in YBa{sub 2}Cu{sub 3}O{sub 7} films on sapphire. Utilizing this process, we built low noise dc SQUIDs as well as other test structures. We designed an electron beam evaporator to grow the superconducting thin films in-situ. I discuss the details of this system. I then explain the motivation for and properties of YBCO/MgO/Sapphire bilayers. I detail the fabrication of various SQUIDs and other test structures. The electrical properties were measured. Magnetic field response and noise are compared with standard theories.

• Research Organization: Texas Univ., Austin, TX (United States)
• OSTI ID: 121342
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
BARIUM OXIDES
COPPER OXIDES
DEPOSITION
FABRICATION
HIGH-TC SUPERCONDUCTORS
MAGNESIUM OXIDES
MAGNETOMETERS
RF SYSTEMS
SAPPHIRE
SQUID DEVICES
SUPERCONDUCTING JUNCTIONS
YTTRIUM OXIDES