Title :
Characterisation of YBCO/Au/YBCO resistors for HTS Josephson noise thermometry
Author :
Hao, L. ; Peden, D.A. ; Macfarlane, J.C. ; Gallop, J.C.
Author_Institution :
Nat. Phys. Lab., Teddington, UK
Abstract :
A crucial component of a resistive SQUID noise thermometer is the shunt resistor, which is required to have a value <0.1 m/spl Omega/. The problems of contact resistance between normal metal and HTS superconducting thin films have up to now hindered the implementation of an HTS resistive SQUID. Suitable Au/YBCO/Au shunt resistors /spl sim/20 /spl mu//spl Omega/ have recently been achieved and their characteristics under cryogenic operating conditions have been measured using the Josephson frequency-voltage relationship.
Keywords :
Josephson effect; SQUIDs; barium compounds; contact resistance; gold; high-temperature superconductors; resistors; superconducting device noise; superconductor-normal-superconductor devices; temperature measurement; thermometers; yttrium compounds; HTSC Josephson noise thermometry; Josephson frequency-voltage relationship; YBaCuO-Au-YBaCuO; contact resistance; cryogenic operating conditions; equivalent circuit; resistive SQUID noise thermometer; shunt resistor; Contact resistance; Cryogenics; Electrical resistance measurement; Gold; High temperature superconductors; Resistors; SQUIDs; Superconducting device noise; Superconducting thin films; Yttrium barium copper oxide;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 2000 Conference on
Conference_Location :
Sydney, NSW, Australia
Print_ISBN :
0-7803-5744-2
DOI :
10.1109/CPEM.2000.851205
