Transport and the order parameter of superconducting (formula presented)

We calculate the ultrasonic absorption and the thermal conductivity in the superconducting state of (formula presented) as functions of temperature and direction of propagation and polarization. Two leading candidates for the superconducting order parameter are considered: the (formula presented) and (formula presented) representations. Both can fit the data except for the ultrasonic absorption in the A phase. To do that, it is necessary to suppose that the system has only a single domain, and that must be chosen as the most favorable one. However, the (formula presented) theory requires fine-tuning of parameters to fit the low-temperature thermal conductivity. Thus, transport data favor the (formula presented) theory. Measurements of the thermal conductivity as a function of pressure at low temperature could help to further distinguish the two theories.