EN IEC 61788-22-2:2021

Superconductivity - Part 22-2: Normal state resistance and critical current measurement - High-Tc Josephson junction

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.

Supraleitfähigkeit - Teil 22-2: Messung des Normalleitungswiderstands und des kritischen Stroms - HTS-Josephson-Kontakt

Supraconductivité - Partie 22-2: Mesurage de la résistance à l’état normal et du courant critique - Jonction Josephson à Tc élevée

L’IEC 61788-22-2:2021 est applicable aux jonctions Josephson à Tc élevée. Elle spécifie les termes, définitions et symboles, ainsi que la méthode de mesure et d’estimation de la résistance à l’état normal (Rn) et du courant critique intrinsèque (Ici) fondée sur l’association de la sélection d’un ensemble de données à partir des courbes U–I mesurées avec un critère de moyenne géométrique et de l’ajustement d’une fonction hyperbolique à cet ensemble de données.

Merjenje upornosti v normalnem stanju in merjenje kritičnega toka - Spoj "High-Tc Josephson" (IEC 61788-22-2:2021)

Ta del standarda IEC 61788 se uporablja za spoje »High-Tc Josephson«. Določa izraze, definicije, simbole ter metodo za merjenje in ocenjevanje upornosti v normalnem obratovalnem stanju (Rn) in intrinzičnega kritičnega toka (Ici) na podlagi kombinacije izbire niza podatkov iz izmerjenih krivulj U–I s kriterijem geometrijske sredine ter prilagajanja hiperbolične funkcije temu nizu podatkov.

General Information

• Status: Published
• Publication Date: 25-Nov-2021
• ICS: 29.050 - Superconductivity and conducting materials
• Technical Committee: CLC/SR 90 - Superconductivity
• Drafting Committee: IEC/TC 90 - IEC_TC_90
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 26-Nov-2021
• Completion Date: 26-Nov-2021
• Ref Project: SIST EN IEC 61788-22-2:2022 - Normal state resistance and critical current measurement - High-Tc Josephson junction (IEC 61788-22-2:2021)

Standards Content (Sample)

SLOVENSKI STANDARD
01-februar-2022
Merjenje upornosti v normalnem stanju in merjenje kritičnega toka - Spoj "High-Tc
Josephson" (IEC 61788-22-2:2021)
Normal state resistance and critical current measurement - High-Tc Josephson junction
(IEC 61788-22-2:2021)
Supraleitfähigkeit - Teil 22-2: Messung des Normalleitungswiderstands und des
kritischen Stroms - HTS Josephson Kontakt (IEC 61788-22-2:2021)
Mesure de la résistance à l’état normal et du courant critique - Jonction Josephson à Tc
élevée (IEC 61788-22-2:2021)
Ta slovenski standard je istoveten z: EN IEC 61788-22-2:2021
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
29.050 Superprevodnost in prevodni Superconductivity and
materiali conducting materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61788-22-2

NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2021
ICS 29.050
English Version
Superconductivity - Part 22-2: Normal state resistance and
critical current measurement - High-T Josephson junction
c
(IEC 61788-22-2:2021)
Supraconductivité - Partie 22-2: Mesure de la résistance à Supraleitfähigkeit - Teil 22-2: Messung des
l'état normal et du courant critique - Jonction Josephson à Normalleitungswiderstands und des kritischen Stroms -
T élevée HTS Josephson Kontakt
c
(IEC 61788-22-2:2021)
(IEC 61788-22-2:2021)
This European Standard was approved by CENELEC on 2021-11-25. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61788-22-2:2021 E

European foreword
The text of document 90/484/FDIS, future edition 1 of IEC 61788-22-2, prepared by IEC/TC 90
“Superconductivity” was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2022–08–25
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2024–11–25
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61788-22-2:2021 was approved by CENELEC as a
European Standard without any modification.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the
relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 61788-22-1 - Superconductivity - Part 22–1: EN 61788-22-1 -
Superconducting electronic devices -
Generic specification for sensors and
detectors
IEC 60050-815 2015 International Electrotechnical Vocabulary - - -
Part 815: Superconductivity
IEC 60617 - Graphical symbols for diagrams - -

IEC 61788-22-2 ®
Edition 1.0 2021-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Superconductivity –
Part 22-2: Normal state resistance and critical current measurement –

High-T Josephson junction:
c
Supraconductivité –
Partie 22-2: Mesurage de la résistance à l’état normal et du courant critique –

Jonction Josephson à T élevée
c
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.050 ISBN 978-2-8322-1039-7

– 2 – IEC 61788-22-2:2021 © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Symbols . 8
5 Principle of measurement method . 9
6 Apparatus . 9
6.1 General . 9
6.2 Cryogenic system . 9
6.3 Electrical measurement system . 10
6.4 Circuitry . 10
7 Estimation of normal state resistance (R ) and intrinsic critical current (I ) . 11
n ci
7.1 Calculation method . 11
7.2 Geometric mean criterion for hyperbolic function fitting . 12
8 Standard uncertainty . 12
8.1 General . 12
8.2 Type A uncertainty . 12
8.3 Type B uncertainty . 14
8.3.1 General . 14
8.3.2 Temperature . 14
8.3.3 Voltage measurement . 16
8.3.4 Current measurement . 16
8.4 Budget table . 17
8.5 Uncertainty requirement . 18
9 Test report . 18
9.1 Identification of test device . 18
9.2 R value . 18
n
9.3 I value . 18
ci
9.4 Standard uncertainty . 18
9.5 Atmospheric pressure . 18
9.6 Miscellaneous optional report . 18
Annex A (informative) Calculation technique and practical application to high-T
c
Josephson junctions . 20
A.1 General . 20
A.2 Hyperbolic function fitting method . 20
A.3 Geometric mean method . 21
A.4 Combined method . 22
A.5 Estimation of R , I , u and u . 23
n ci A,R A,I
A.5.1 General . 23
A.5.2 High-T Josephson junction (JL350) . 23
c
A.5.3 High-T Josephson junction (JL351) . 25
c
A.5.4 High-T Josephson junction (TUT) . 27
c
Annex B (informative) Practical application to low-T Josephson junctions . 30
c
IEC 61788-22-2:2021 © IEC 2021 – 3 –
B.1 General . 30
B.2 Estimation of R , I , u and u . 30
n ci A,R A,I
B.2.1 General . 30
B.2.2 Low-T Josephson junction (IU1) . 30
c
B.2.3 Low-T Josephson junction (IU2) . 31
c
B.2.4 Low-T Josephson junction (IU3) . 32
c
B.2.5 Low-T Josephson junction (IU4) . 34
c
Bibliography . 35

Figure 1 – Typical circuitry for voltage-current (U–I) characteristic curve measurement . 10
Figure 2 – Ideal U–I characteristic curve (red line) and hyperbolic function (RSJ) model
curve (dotted line) . 11
Figure 3 – Geometric mean criterion and RSJ model fitting for TUT-JJ05 at 75,8 K . 15
Figure 4 – Geometric mean criterion and RSJ model fitting for TUT-JJ05 at 76,3 K . 16
Figure A.1 – U–I curve based on resistively shunted junction (RSJ) model . 21
Figure A.2 – U–I curve affected by noise-rounding and self-heating . 21
Figure A.3 – Application of geometric mean method to ideal U–I in Figure A.1 . 22
Figure A.4 – Application of geometric mean method to U–I with noise-rounding and
self-heating effects in Figure A.2. 23
Figure A.5 – U–I curve of JL350 . 24
Figure A.6 – Application of geometric mean method to Figure A.5 . 24
Figure A.7 – Result of RSJ model fitting for JL350 . 25
Figure A.8 – U–I curve of JL351 . 26
Figure A.9 – Application of geometric mean method to Figure A.8 .
...