In order to distinguish the superconducting phases of the title compounds we have studied their DC magnetic properties in low fields with a SQUID magnetometer. The magnetic penetration depth of UPt3 shows the second superconducting transition at Tc- when the field, is applied along the c-axis, but not with H⊥c. This result, combined with a power law behavior of λ at low temperatures, is most consistent with the two-dimensional E2u order parameter symmetry. Below 20mK we find an additional diamagnetic signal which we ascribe to the normal state magnetism. For Sr2RuO4, supposedly a p-wave superconductor, we find a sharp single diamagnetic transition at 1.08 K showing that our sample is of high quality, but there is no indication of an unusual superconducting behavior.
- Heavy-fermion systems
- SQUID magnetization
- Superconducting penetration depth
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics