J Schurr et al 2006 Metrologia 43 163 doi:10.1088/0026-1394/43/1/021
J Schurr1, F-J Ahlers1, G Hein1, J Melcher1, K Pierz1, F Overney2 and B M Wood3
Show affiliationsA new coaxial measurement system has been developed to investigate the ac longitudinal resistance along the high-potential side of the quantum Hall resistance (QHR). A novel equivalent circuit of the QHR is used to analyse the ac measurements of the longitudinal resistances along both the low- and high-potential sides of the QHR sample. In addition, a bridge for the measurement of ac contact resistances of the sample is presented. For the first time, it is now possible to perform all the ac measurements whose dc equivalents are well established for reliable dc quantum Hall measurements. While the ac longitudinal resistances on the high- and low-potential sides of the sample are very similar, interesting differences have been observed at high resolution.
Issue 1 (February 2006)
Received 15 September 2005
Published 27 January 2006
J Schurr et al 2006 Metrologia 43 163
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