Delocalized quasiparticles

Results on the thermal conductivity in the superconducting mixed state have been reported for LuNi2B2C for temperatures down to 70 mK (7c/200) and magnetic fields from H — 0 to above Hc2 = 70 kOe (Boaknin et al. 2001, see fig. 24). It was found that as soon as vortices enter the sample, the thermal conductivity at T - 0 grows rapidly, showing unambiguously that delocalized quasiparticles are present even at the... 

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