Well according to an interview with the group leader at Fraunhofer, they achieve 1 Kelvin in the lab, long way to go. Of course some current has to flow in orde

Well according to an interview with the group leader at Fraunhofer, they achieve 1 Kelvin in the lab, long way to go. Of course some current has to flow in order to establish the field and as long as the polarized atoms in the material are aligning (the thing is a capacity, the ceramic material a dielectricum).