Thursday, November 29, 2012

1211.6570 (F. Giazotto et al.)

Phase-tunable colossal magneto-heat resistance in ferromagnetic
Josephson thermal valves
   [PDF]

F. Giazotto, F. S. Bergeret
We propose a heat valve based on the interplay between thermal transport and proximity-induced exchange splitting in Josephson tunnel junctions. We demonstrate that the junction heat conductance strongly depends on the relative alignment of the exchange fields induced in the superconductors. Colossal magneto-heat resistance ratios as large as 10^7% are predicted to occur under proper temperature and phase conditions, as well as suitable ferromagnet-superconductor combinations. Moreover, the quantum phase tailoring, intrinsic to the Josephson coupling, offers an additional degree of freedom for the control of the heat conductance. Our predictions for the phase-coherent and spin-dependent tuning of the thermal flux can provide a useful tool for heat management at the nanoscale.
View original: http://arxiv.org/abs/1211.6570

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