We propose a model of nodal order parameters for the superconducting A and B - phase of skutterudite PrOs_4Sb_{12} and discuss the associated angular dependent magnetothermal conductivity at low temperatures. The model for the hybrid gap functions \De(k) containing an s- and g- wave parts is consistent with recent thermal conductivity experiments in PrOs_4Sb_12. In particular the model accounts for the data on polar an azimuthal field angle dependence of \kappa_zz(\theta,\phi). The low temperature behaviour of thermodynamic properties in zero field is also presented. We show that the effect of impurity scattering on a nodal hybrid gap function immediately leads the opening of a gap and related exponential behaviour of low temperature specific heat and thermal conductivity which is very different from d- wave superconductors.
@article{arxiv.cond-mat/0212090,
title = {Multiphase Superconductivity in Skutterudite PrOs_4Sb_12},
author = {K. Maki and H. Won and P. Thalmeier and Q. Yuan and K. Izawa and Y. Matsuda},
journal= {arXiv preprint arXiv:cond-mat/0212090},
year = {2009}
}