K. Enpuku, VOLTAGE VERSUS FLUX RELATION OF HIGH T(C) DC SUPERCONDUCTING QUANTUM INTERFERENCE DEVICE WITH DIFFERENT INDUCTANCES, JPN J A P 2, 32(10A), 1993, pp. 120001407-120001409
The voltage versus flux (V-PHI) relation of dc superconducting quantum
interference devices (SQUIDs) in the presence of thermal noise at T=7
7 K is studied. A theoretical expression for the modulation-voltage DE
LTAV in the V-PHI relation is presented as a function of SQUID inducta
nce. The theoretical expression is compared with experimental results
of DELTAV reported recently for high T(c) SQUIDs with different induct
ances. It is shown that experimental results agree quantitatively with
theoretical ones. It is also shown that imperfection of Josephson jun
ctions degrades the modulation voltage more significantly when the ind
uctance increases. The dependence of the modulation voltage on the ind
uctance clarified in the paper is useful for developing a magnetic sen
sor using the SQUID.