Superconducting aluminum heat switch with 3 nO equivalent resistance

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F22%3A10447018" target="_blank" >RIV/00216208:11320/22:10447018 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=IrpsUkwHMi" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=IrpsUkwHMi</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/5.0079639" target="_blank" >10.1063/5.0079639</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Superconducting aluminum heat switch with 3 nO equivalent resistance

Popis výsledku v původním jazyce

Superconducting heat switches with extremely low normal state resistances are needed for constructing continuous nuclear demagnetization refrigerators with high cooling power. Aluminum is a suitable superconductor for the heat switch because of its high Debye temperature and its commercial availability in high purity. We have constructed a high quality Al heat switch whose design is significantly different than that of previous heat switches. In order to join the Al to Cu with low contact resistance, we plasma etched the Al to remove its oxide layer and then immediately deposited Au without breaking the vacuum of the e-beam evaporator. In the normal state of the heat switch, we measured a thermal conductance of 8T W/K-2, which is equivalent to an electrical resistance of 3 n omega according to the Wiedemann-Franz law. In the superconducting state, we measured a thermal conductance that is 2 x 10(6) times lower than that of the normal state at 50 mK.&amp; nbsp;Published under an exclusive license by AIP Publishing.

Název v anglickém jazyce

Superconducting aluminum heat switch with 3 nO equivalent resistance

Popis výsledku anglicky

Superconducting heat switches with extremely low normal state resistances are needed for constructing continuous nuclear demagnetization refrigerators with high cooling power. Aluminum is a suitable superconductor for the heat switch because of its high Debye temperature and its commercial availability in high purity. We have constructed a high quality Al heat switch whose design is significantly different than that of previous heat switches. In order to join the Al to Cu with low contact resistance, we plasma etched the Al to remove its oxide layer and then immediately deposited Au without breaking the vacuum of the e-beam evaporator. In the normal state of the heat switch, we measured a thermal conductance of 8T W/K-2, which is equivalent to an electrical resistance of 3 n omega according to the Wiedemann-Franz law. In the superconducting state, we measured a thermal conductance that is 2 x 10(6) times lower than that of the normal state at 50 mK.&amp; nbsp;Published under an exclusive license by AIP Publishing.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

20100 - Civil engineering

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Review of Scientific Instruments

ISSN

0034-6748

e-ISSN

1089-7623

Svazek periodika

93

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

4

Strana od-do

034901

Kód UT WoS článku

000784333800002

EID výsledku v databázi Scopus

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