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Displaying 226 - 250 of 275

Cryogenic Current Comparator Measurements at 77 K Using Thallium-2223 Thick-film Shields

April 1, 1999

Author(s)

Randolph E. Elmquist

Several different magnetic shield geometries were used to study cryogenic current compactor (CCC) operation with thallium-based thick film superconducting shields at 77 K. These shields are found to have good magnetic shielding properties and to support

Calculating the Effects of Longitudinal Resistance in Multi-Series-Connected Quantum Hall Effect Devices

November 1, 1998

Author(s)

Marvin E. Cage, Anne-Marie Jeffery, Randolph Elmquist, Kevin C. Lee

Many ac quantized Hall resistance experiments have measured significant values of ac longitudinal resistances under temperature and magnetic field conditions in which the dc longitudinal resistance values were negligible. We investigate the effect of non

Cryogenic Current Comparator Measurements at 77 K Using Thallium-2223 Thick-film Shields

July 1, 1998

Author(s)

Randolph E. Elmquist

This paper describes resistance ratio measurements using cryogenic current comparator (CCC) devices that operate at 77 K. The magnetic shields are Thallium-based thick films on MgO substrates. The effectiveness of three shield geometries is determined

Suggested Triple-Series Connection Measurement Tests of the AC Quantized Hall Resistance and the AC Longitudinal Resistance

July 1, 1998

Author(s)

Marvin E. Cage, Anne-Marie Jeffery, Randolph Elmquist

We find from equivalent circuit calculations that a single ac ratio bridge could be used to measure the ac quantized Hall resistance and to also provide independent values of the ac longitudinal resistance in a quantum Hall effect device by making