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BS EN IEC 61788-22-2:2021

BS EN IEC 61788-22-2:2021

$167.15

Superconductivity – Normal state resistance and critical current measurement. High-Tc Josephson junction

Published By Publication Date Number of Pages
BSI 2021 42
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This part of IEC 61788 is applicable to high-Tc Josephson junctions. It specifies terms, definitions, symbols and the measurement and estimation method for normal state resistance (Rn) and intrinsic critical current (Ici), based on a combination of selecting a data set from measured U-I curves with a geometric mean criterion and fitting a hyperbolic function to that data set.

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PDF Pages PDF Title
2 undefined
5 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
7 English
CONTENTS
9 FOREWORD
11 INTRODUCTION
12 1 Scope
2 Normative references
3 Terms and definitions
13 4 Symbols
14 5 Principle of measurement method
6 Apparatus
6.1 General
6.2 Cryogenic system
15 6.3 Electrical measurement system
6.4 Circuitry
Figures
Figure 1 – Typical circuitry for voltage-current (U–I) characteristic curve measurement
16 7 Estimation of normal state resistance (Rn) and intrinsic critical current (Ici)
7.1 Calculation method
Figure 2 – Ideal U–I characteristic curve (red line) andhyperbolic function (RSJ) model curve (dotted line)
17 7.2 Geometric mean criterion for hyperbolic function fitting
8 Standard uncertainty
8.1 General
8.2 Type A uncertainty
19 8.3 Type B uncertainty
8.3.1 General
8.3.2 Temperature
Tables
Table 1 – Typical relative standard Type A uncertaintyfor high-Tc Josephson junctions
20 Figure 3 – Geometric mean criterion and RSJ model fitting for TUT-JJ05 at 75,8 K
21 8.3.3 Voltage measurement
8.3.4 Current measurement
Figure 4 – Geometric mean criterion and RSJ model fitting for TUT-JJ05 at 76,3 K
22 8.4 Budget table
Table 2 – Budget table for Rn
Table 3 – Budget table for Ici
23 8.5 Uncertainty requirement
9 Test report
9.1 Identification of test device
9.2 Rn value
9.3 Ici value
9.4 Standard uncertainty
9.5 Atmospheric pressure
9.6 Miscellaneous optional report
25 Annex A (informative)Calculation technique and practical applicationto high-Tc Josephson junctions
A.1 General
A.2 Hyperbolic function fitting method
26 A.3 Geometric mean method
Figure A.1 – U–I curve based on resistively shunted junction (RSJ) model
Figure A.2 – U–I curve affected by noise-rounding and self-heating
27 A.4 Combined method
Figure A.3 – Application of geometric mean method to ideal U–I in Figure A.1
28 A.5 Estimation of Rn, Ici, uA,R and uA,I
A.5.1 General
A.5.2 High-Tc Josephson junction (JL350)
Figure A.4 – Application of geometric mean method to U–Iwith noise-rounding and self-heating effects in Figure A.2
Table A.1 – Rn, Ici, uA,R and uA,I values of high-Tc Josephson junctions
29 Figure A.5 – U–I curve of JL350
Figure A.6 – Application of geometric mean method to Figure A.5
30 A.5.3 High-Tc Josephson junction (JL351)
Figure A.7 – Result of RSJ model fitting for JL350
31 Figure A.8 – U–I curve of JL351
Figure A.9 – Application of geometric mean method to Figure A.8
32 A.5.4 High-Tc Josephson junction (TUT)
Figure A.10 – Result of RSJ model fitting for JL351
33 Figure A.11 – U–I curve of TUT with a small Im
Figure A.12 – Application of geometric mean method to TUT
34 Figure A.13 – Application of adjusted geometrical mean method to TUT
Figure A.14 – Result of RSJ model fitting for TUT
35 Annex B (informative)Practical application to low-Tc Josephson junctions
B.1 General
B.2 Estimation of Rn, Ici, uA,R and uA,I
B.2.1 General
B.2.2 Low-Tc Josephson junction (IU1)
Table B.1 – Rn, Ici, uA,R and uA,I values of low-Tc Josephson junctions
36 B.2.3 Low-Tc Josephson junction (IU2)
Figure B.1 – Application of geometric mean method to IU1
Figure B.2 – Result of RSJ model fitting for IU1
37 B.2.4 Low-Tc Josephson junction (IU3)
Figure B.3 – Application of geometric mean method to IU2
Figure B.4 – Result of RSJ model fitting for IU2
38 Figure B.5 – Application of geometric mean method to IU3
Figure B.6 – Result of RSJ model fitting for IU3
39 B.2.5 Low-Tc Josephson junction (IU4)
Figure B.7 – Application of geometric mean method to IU4
Figure B.8 – Result of RSJ model fitting for IU4
40 Bibliography

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