Title :
Effects of guard surfaces on AC quantized Hall resistance steps
Author :
Ricketts, Brian W. ; Fiander, John R. ; Johnson, H. Leigh
Author_Institution :
Nat. Meas. Inst., Lindfield, NSW, Australia
fDate :
4/1/2005 12:00:00 AM
Abstract :
Measurements of AC QHR steps using a transformer bridge with a four-port connection to a QHR device are reported. Guard surfaces are used with the aim of reducing the capacitive coupling of the QHR device to surrounding conductors. Results obtained by adjustment of the potential of one of the guard surfaces and by reversal of the magnetic field suggest that at least some of the features of AC QHR steps cannot be explained by capacitive coupling alone.
Keywords :
Hall effect devices; electric resistance measurement; magnetic fields; quantum Hall effect; AC quantized Hall resistance steps; QHR device; capacitive coupling; coaxial AC bridge; four-port connection; guard surfaces; magnetic field reversal; quantum Hall effect; transformer bridge; Australia; Bridge circuits; Cables; Conductors; Frequency measurement; Impedance measurement; Magnetic field measurement; Printed circuits; Probes; Surface resistance; Coaxial ac bridge; impedance; quantum Hall effect;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2004.843124
