Journal
REVIEW OF SCIENTIFIC INSTRUMENTS
Volume 80, Issue 6, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3152219
Keywords
barium compounds; magnetic field measurement; potassium compounds; radiofrequency integrated circuits; radiofrequency oscillators; superconducting critical field
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Funding
- NSF [NSF-DMR-0654118, NSF-DMR 0602859]
- DOE
- State of Florida
- LANL [LDRD-DR20070013]
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A radio frequency oscillator circuit based on a proximity detector integrated circuit is described as an alternative for the traditional tunnel diode oscillator used for pulsed magnetic field measurements at low temperatures. The proximity detector circuit design, although less sensitive than tunnel diode oscillator circuits, has a number of essential advantages for measurements in the extreme environments of pulsed magnetic fields. These include the insensitivity of operation to voltages induced in the inductor coil, the elimination of a diode bias circuit and tuning, and a broad dynamic range of resonant frequency variation. The circuit has been successfully applied to measure the superconducting upper critical field in Ba0.55K0.45Fe2As2 single crystals up to 60 T.
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