Effect of superconductivity on microscale radiative heat transfer

0464592 - ÚPT 2017 RIV FR eng C - Conference Paper (international conference)
Králík, Tomáš - Fořt, Tomáš - Musilová, Věra - Srnka, Aleš
Effect of superconductivity on microscale radiative heat transfer.
1st International Conference IIR of Cryogenics and Refrigeration Technology (Booklet). Paris: IIF/IIR, 2016, s. 56-61. ISBN 978-2-36215-017-3.
[International Conference IIR of Cryogenics and Refrigeration Technology /1./. Bucharest (RO), 22.06.2016-25.06.2016]
R&D Projects: GA ČR(CZ) GA14-07397S; GA MŠMT(CZ) LO1212
Institutional support: RVO:68081731
Keywords : thermal radiation * near field * superconductivity
Subject RIV: BM - Solid Matter Physics ; Magnetism

Radiative heat transfer over short distances smaller than wavelengths in the spectrum of radiating surface is enhanced by near field effect. We studied radiative heat transfer between plane parallel surfaces of niobium films (critical temperature 9 K) sputtered on sapphire. The radiative heat flow was 20 times enhanced above the values given by Planck’s law (far-field values) in this measurement. Steep decrease of heat flow by a factor of five, caused by transition to superconducting state, was observed in the near field regime.
Permanent Link: http://hdl.handle.net/11104/0263433