λ-Shaped Ultrasound-Attenuation Peak in Superconducting (U,Th)Be13
Published Web Location
https://doi.org/10.1103/physrevlett.55.1319
Abstract
We report measurements of the ultrasound attenuation and the changes in the sound velocity of the heavy-fermion superconductor (U,Th)Be13. This material has shown evidence of two transitions, a bulk superconducting transition at Tc1 and a lower one at Tc2. Near Tc2 we find a λ-shaped attenuation peak two orders of magnitude larger than the total contribution from particle-hole scattering, and a dip in the c11 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 Tc2.
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