• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Very High Precision Measurements of Quqntized Hall Resistances

Research Project

Project/Area Number 03044126
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research InstitutionGakushuin University

Principal Investigator

KAWAJI Shinji  Gakushuin University, Faculty of Science・Professor, 理学部, 教授 (00080440)

Co-Investigator(Kenkyū-buntansha) RICKETTS B. W.  Csiro・Nml・Senior Scientist, CSIRO National Measurement Labor, 主任研究員
SMALL G. W.  Csiro・Nml・Principal Scientist, CSIRO National Measurement Labor, 主幹研究員
Project Period (FY) 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1991: ¥3,000,000 (Direct Cost: ¥3,000,000)
Keywordsquantized Hall resistance / quantum Hall effect / high precision measurement
Research Abstract

On behalf of the Head Investigator, Nagata, M. (graduate student of Gakushuin University) visited CSIRO ・ NML with@a 1 OMEGA standard resistor. He stayed there for 23 days and investigated works carried out by the Impedance Group ; (1) the manufacture of 1 OMEGA standard resistors and the calibration of them based on a calculable capacitor, (2) comparisons between 1 OMEGA standard resistors, (3) (6453+9/4) OMEGA Build-Up Resistor, @ (4) @Cryogenic Current Comparator planning. A new 1 OMEGA standard resistor was carried by his own hands to Gakushuin University. Dr. Sniall visited Gakushuin University to collaborate with Kawaji's group for 2 weeks in improving the Cryogenic Current Comparator System for the very high precision measurements of quantized Hall resistances. Dr. Small enabled to use the Cryogenic Current Comparator System for the QHR (quantized Hall resistance) measurements except a 0.02 ppm level error. Dr. Ricketts visited Gakushiuin University with a calibrated 10 kOMEGAresistor to remove the 0.02 ppm level error in the Cryogenic Current Comparator System. He stayed for 13 days. After finding the origin of the error, measurements of QHR with the quantum number 2 and 4 measurements were carried out. The average value of four measurements of QHR with the quantum number 2, R_H (2), is described as [2xR_H(2)/25812.8 OMEGA _<SI-SCIRO>]-1=[0.385 (+0.03) <minus-plus>0.01] ==, wjere (+0.03) ppm uncertainty is a possible statematic uncertainty which is under investigation a person. The average value of two QHR measurements with the quantum number 4, Ru (4), is 0.01 ppm larger than R_H (2) although they are in agreement within their uncertainties.

Report

(1 results)
  • 1991 Final Research Report Summary
  • Research Products

    (1 results)

All Other

All Publications (1 results)

  • [Publications] S.Kawaji,M.Nagata,G.W.Small and B.W.Ricketts: "Very High Precision Measurements of Quantized Hall Rersistances" IEEE Transaction Meas.and Instrum.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary

URL: 

Published: 1991-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi