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Science 14 October 1988:
Vol. 242. no. 4876, pp. 217 - 223
DOI: 10.1126/science.242.4876.217
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Articles

The Impact of High-Temperature Superconductivity on SQUID Magnetometers

John Clarke 1 and Roger H. Koch 2

1 Department of Physics, University of California, and the Center for Advanced Materials, Materials and Chemical Sciences Division, Lawrence Berkeley Laboratory, Berkeley, CA 94720
2 IBM Research Division, Thomas J. Watson Research Center, Yorktown Heights, NY 10598

DC and RF Superconducting QUantum Interference Devices (SQUIDs) fabricated from low transition temperature (Tc) superconductors and operated at liquid 4He temperatures are routinely used as ultrasensitive detectors in many applications, for example, as magnetometers, magnetic gradiometers, voltmeters, and motion detectors. SQUIDs fabricated from high Tc superconductors such as YBa2Cu3O7 and operated in liquid nitrogen at 77 K offer a greater convenience in operation at the expense of a poorer noise performance, particularly at low frequencies. The resolution of SQUID-based magnetometers is compared with that of other types of magnetometers operatng at ambient temperatures.


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