Peltier-effect in the mixed state of (Bi,Pb)2Sr2Ca2Cu3Oδ

We present measurements of the Peltier-effect in the mixed state of Bi_1.76Pb_0.24Sr₂Ca₂Cu₃O_δ. The Peltier-coefficient broadens in a magnetic field quite similar to the resistivity and the thermopower. Comparison with the thermopower shows that Onsagers relation holds well. The occurrence of the Peltier-heat in the mixed state well below T_c implies that the electric current is accompanied by a large heat current. We show that the vortex contribution to the Peltier-heat is negligibly small. Therefore the heat current has to be attributed to normal quasiparticle excitations. Our results indicate that this quasiparticle contribution to the heat current remains large even at temperatures far below T_c.