Electricity: measuring and testing – Determining nonelectric properties by measuring electric... – Superconductors
Patent
1988-08-31
1989-07-25
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Determining nonelectric properties by measuring electric...
Superconductors
324 58C, 324 58R, 324233, 324316, 505843, G01N 2714, G01R 2704
Patent
active
048517623
ABSTRACT:
The invention relates to a method and apparatus to detect the superconductive state by measuring the change in the resistance of a sample. A dc magnetic field is imposed on the sample while the temperature is swept. The strength of the magnetic field is held below the critical value and is frequency modulated by the application of an ac field in such a way that total magnetic field is always positive. The resistance of the sample is measured incrementally as the temperature is swept and is phase detected at the modulation frequency. According to this embodiment, only magnetic field dependent changes demonstrating a precipitous drop in resistance identify a composition as superconductive.
REFERENCES:
patent: 4185237 (1980-01-01), Uehara et al.
patent: 4674513 (1987-06-01), Jasper, Jr.
Khachaturyan et al., "Changes in Microwave Absorption of New High Tc Superconductors . . . ;" Mat. Res. Soc. Symp. Proc., vol. 99, pp. 383-386, Dec. 4, 1987.
Berlinger et al., "Two Multipurpose EPR Cavities . . . ," Rev. Sci. Instrum., vol. 48, No. 9, pp. 1161-1168, Sep. 1977.
Adrain Frank J.
Bohandy Joseph
Kim Boris F.
Moorjani Kishin
Archibald Robert E.
Beall Mary Louise
Eisenzopf Reinhard J.
Miele Anthony L.
The John Hopkins University
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