  Scaling relations are one of the hallmarks of nodal superconductivity since
they contain information characteristic for gapless order parameters. In this
paper we derive the scaling relations for the thermodynamics and the thermal
conductivity in the vortex state of the A and B phases of the skutterudite
PrOs4Sb12. Experimental confirmation of these scaling relations can provide
further support for anisotropic gap functions which were previously considered
for this material.
