Thermal transport in superconductor/normal-metal structures
نویسنده
چکیده
We review experiments over the last ten years on thermal transport in mesoscopic normal metals in contact with a superconductor. The main focus of this effort has been on the exploration of coherent thermal effects in mesoscopic normal-metal/superconductor structures, i.e. effects in which the phase of the quasiparticles participating in thermal transport is important. Coherence in thermal transport manifests itself as oscillations of the thermal conductance and the thermopower of mesoscopic devices with an externally applied magnetic field. (Some figures in this article are in colour only in the electronic version)
منابع مشابه
Nonlinear thermoelectric effects in high-field superconductor-ferromagnet tunnel junctions
Background: Thermoelectric effects result from the coupling of charge and heat transport and can be used for thermometry, cooling and harvesting of thermal energy. The microscopic origin of thermoelectric effects is a broken electron-hole symmetry, which is usually quite small in metal structures. In addition, thermoelectric effects decrease towards low temperatures, which usually makes them va...
متن کاملThermal conductance by the inverse proximity effect in a superconductor.
We study heat transport in hybrid lateral normal-metal-superconductor-normal-metal structures. We find the thermal conductance of a short superconducting wire to be strongly enhanced beyond the BCS value due to the inverse proximity effect, resulting from contributions of elastic cotunneling and crossed Andreev reflection of quasiparticles. Our measurements agree with a model based on the quasi...
متن کاملOrigin of hysteresis in a proximity josephson junction.
We investigate hysteresis in the transport properties of superconductor-normal-metal-superconductor (S-N-S) junctions at low temperatures by measuring directly the electron temperature in the normal metal. Our results demonstrate unambiguously that the hysteresis results from an increase of the normal-metal electron temperature once the junction switches to the resistive state. In our geometry,...
متن کاملDivergence at low bias and down-mixing of the current noise in a diffusive superconductor-normal-metal-superconductor junction.
We present current noise measurements in a long diffusive superconductor-normal-metal-superconductor junction in the low voltage regime, in which transport can be partially described in terms of coherent multiple Andreev reflections. We show that, when decreasing voltage, the current noise exhibits a strong divergence together with a broad peak. We ascribe this peak to the mixing between the ac...
متن کاملResponse time of a thermometer based on normal metal–insulator–superconductor (NIS) tunnel junctions
We have measured the thermal response of a superconductor–normal metal–superconductor (SINIS) tunnel junction structure at substrate temperature ∼ 60 mK by directly heating the electron system in the normal metal island. In our structure, we /nd the response time is determined by the electron–phonon coupling in the electron temperature range 300–600 mK. By using AC heating, the cut-o4 frequency...
متن کامل