Abstract
Near-field radiative heat transfer (NFRHT) management can be achieved using high-temperature superconductors. In this work, we present a theoretical study of the radiative heat transfer between two hbox {YBa}_2hbox {Cu}_3hbox {O}_{6.95} (YBCO) slabs in three different scenarios: Both slabs either in the normal or superconducting state, and only one of them below the superconductor critical temperature T_c. The radiative heat transfer is calculated using Rytov’s theory of fluctuating electrodynamics, while a two-fluid model describes the dielectric function of the superconducting materials. Our main result is the significant suppression of the NFRHT when one or both of the slabs are superconducting, which is explained in terms of the detailed balance of the charge carriers density together with the sudden reduction of the free electron scattering rate. A critical and unique feature affecting the radiative heat transfer between high-temperature superconductors is the large damping of the mid-infrared carriers which screens the surface plasmon excitation.
Highlights
Near-field radiative heat transfer (NFRHT) management can be achieved using high-temperature superconductors
To analyze the effect of the superconductive transition on the radiative heat transfer for a nanometric separation between two high-Tc superconductors, we consider the three following cases: (1) the temperature of both YBCO plates is above the superconducting transition, i.e., T1, T2 Tc ; (2) one plate is in the normal state, T1 > Tc, and the other is in the superconducting phase, T2 < Tc ; and (3) both plates are in the superconducting state, T1, T2 < Tc
For T > Tc, in the absence of the other contributions, the Drude term would allow the excitation of a gap surface plasmon polariton (G-SPP) associated only to the free electrons
Summary
Near-field radiative heat transfer (NFRHT) management can be achieved using high-temperature superconductors. Based on the experimental data, for temperatures above Tc , the dielectric function of YBa2Cu3O6.95 on the ab-plane is described by a Drude contribution of free charge carriers plus an additional term in the mid-infrared frequencies (MIR) modeled by a Lorentz-type resonance.
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