Theory of "ferrisuperconductivity" in U1-xThxBe13.

We construct a two component Ginzburg-Landau theory with coherent pair motion and incoherent quasiparticles for the phase diagram of U1-xThxBe13. The two staggered superconducting states live at the Brillouin zone center and the zone boundary and coexist for temperatures T<or=Tc2 at concentrations xc1 approximately 0. 02<or=x<or=xc2 approximately 0.04. We predict below Tc2 the appearance of a charge density wave (CDW) and Be-sublattice distortion. The distortion explains the muon spin relaxation anomaly; Th-impurity mediated scattering of ultrasound to CDW fluctuations explains the attenuation peak.