Generalized Kadowaki-Woods relation in heavy fermion systems with orbital degeneracy

dWe present a theoretical Study of the Kadowaki-Woods relation in the orbitally degenerate periodic Anderson model. Based oil the Fermi liquid theory. we derive the generalized Kadowaki-Woods relationin the strong coupling limit, Ay(-2) approximate to 10(-5)/ 1/2 N(N - 1) [ muOmegacm (mol . K/mJ)(2)], where A is the coefficient of the T-2 term in the resistivity, gamma is the T-linear specific heat coefficient, and N is the f-orbital degeneracy. This result naturally explains the remarkably smaller value of Ay(-2) in various orbitally degenerate (mainly Yb-based) heavy Fermion systems, reported by Tsujii et al.