Heat transport and electron cooling in ballistic   normal-metal/spin-filter/superconductor junctions
  We investigate electron cooling based on a clean normal-metal/spin-filter/superconductor junction. Due to the suppression of the Andreev reflection by the spin-filter effect, the cooling power of the system is found to be extremely higher than that for conventional normal-metal/nonmagnetic-insulator/superconductor coolers. Therefore we can extract large amount of heat from normal metals. Our results strongly indicate the practical usefulness of the spin-filter effect for cooling detectors, sensors, and quantum bits. 
Shiro Kawabata, Andrey S. Vasenko, Asier Ozaeta, F. Sebastian   Bergeret, Frank W. J. Hekking
cond-mat.mes-hall cond-mat.supr-con