Abstract
We report measurements of the ultrasound attenuation and the changes in the sound velocity of the heavy-fermion superconductor (U,Th). This material has shown evidence of two transitions, a bulk superconducting transition at and a lower one at . Near we find a -shaped attenuation peak two orders of magnitude larger than the total contribution from particle-hole scattering, and a dip in the elastic constant. These results are consistent with those expected near a magnetic transition. A state of coexisting anisotropic superconductivity and (antiferro-) magnetic order is suggested below .
- Received 28 May 1985
DOI:https://doi.org/10.1103/PhysRevLett.55.1319
©1985 American Physical Society