Low-noise measurements of the quantized Hall resistance using an improved cryogenic current comparator bridge

Author

Delahaye, F. ; Bournaud, D.

Author_Institution

Bur. Int. des Poids et Mesures, Sevres, France

fYear

1990

fDate

11-14 June 1990

Firstpage

304

Lastpage

305

Abstract

Significant improvements have been made on the bridge based on a cryogenic current comparator (CCC bridge) that is used at the Bureau International des Poids et Mesures, France (BIPM), for measurements of the quantized Hall resistance (QHR). Specifically, a SQUID (superconducting quantum interference device)-based DC nanovoltmeter and a new CCC with an increased number of turns have been built and incorporated into the bridge. QHR measurements with a very low noise level (2 parts in 10/sup 9/ of the ratio of the QHR to a 100- Omega standard) have been carried out using this improved bridge.<>

Keywords

SQUIDs; bridge instruments; electric resistance measurement; low-temperature techniques; measurement standards; quantum Hall effect; voltmeters; BIPM; Bureau International des Poids et Mesures; France; SQUID; cryogenic current comparator bridge; low noise measurement; nanovoltmeter; quantized Hall resistance; superconducting quantum interference device; Bridges; Cryogenics; Current measurement; Electrical resistance measurement; Interference; Nanoscale devices; Noise measurement; SQUIDs; Superconducting device noise; Superconducting devices;

fLanguage

English

Publisher

ieee

Conference_Titel

Precision Electromagnetic Measurements, 1990. CPEM '90 Digest., Conference on

Conference_Location

Ottawa, Ontario, Canada

Type

conf

DOI

10.1109/CPEM.1990.110033

Filename

110033