Identification of the orbital pairing symmetry in UPt3

This paper summarizes the results of a comprehensive analysis of the thermo dynamic and transport data for the superconducting phases of UPt3. Calculat ions of the transverse sound attenuation as a function of temperature, freq uency, polarization, and disorder are presented for the leading models of t he superconducting order parameter. Measurements of the specific heat, ther mal conductivity, and transverse sound attenuation place strong constraints on the orbital symmetry of the superconducting order parameter. We show th at the superconducting A and B phases are in excellent agreement with pairi ng states belonging to the odd-parity E-2u orbital representation.