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Abstract squids ceramic.
The squids operated reliably at liquid nitrogen temperature and proved to be stable over time.
The directly measured external field sensitivity for one hole squid was at the level of 100 ft hz.
Squid magnetometers using high t c superconductors is reviewed.
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Encouraging noise figures better than 10 3 ϕ o h z are reported for both one hole and 2 hole rf squids at liquid nitrogen temperatures but the development of thin film dc squids has been less successful.
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Gough flux quantisation and squid magnetometry 3.
Ceramic rf squids after the procedure of optimization this one contact high te rf squid shows the main characteristics very close to those of the conventional low temperature rf squids.
Progress in the development of rf and dc squids using high tc superconductors is reviewed following a brief description of the measurement of the flux quantum.
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Although operation at liquid nitrogen temperatures is shown to place an upper limit on attainable sensitivities above 100 hz the performance of r f.
Squids is already within a factor of three to five of their liquid helium cooled counterparts.
The authors fabricated several versions of zimmerman type rf squids superconducting quantum interference devices from bulk ceramic yba2cu3o x samples and studied their characteristics.
Influence of light on magnetic properties of ceramic high t c superconductors has been investigated with a squid magnetometer having an optical access to the sample space our data reveal a light induced reduction of the magnetic moment just below t c and another change increasing with decreasing temperature below t c 2.
The main squid parameters.
One and two hole ybco ceramic rf squids operating at liquid nitrogen temperatures have been developed.
The development of granular and geometrically defined r f.
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This immediately suggested the possibility of using such rings as if squids the ceramic material providing both the superconducting ring and its own weak link.
The latter effect has been found in labacuo bicasrcuo and ybacuo.
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Self inductance white noise level and magnetic flux resolution were measured.
In figures 1 and 2 volt current and voltoersted characteristics of the squid at liquid nitrogen temperature are shown with the inductance approximately 2 lo 10.
