Penetration depth and torque of superconducting UPt3

S. Schöttl, E. Schuberth, K. Flachbart, J. Kycia, A. Menovsky

Research output: Contribution to journalArticlepeer-review


In order to identify the properties of the internal superconducting phases of UPt3 we studied the DC penetration depth in a SQUID system and the anisotropic s.c. response in a magnetic torque meter on three high-quality single crystals down to 5 mK. Near TC and with B in the c-direction we find a distinct s.c. double transition. With B along the a-axis there is only a single transition. These results seem to be in favor of a two-dimensional s.c. order parameter. At lower temperatures a power law λ ∼ T2 is found for B∥c, whereas in the a-direction a T1 dependence occurs. However, both power laws do not continue to very low temperatures, but are followed by a slight 'paramagnetic' increase below 30 mK and a sharp 'diamagnetic' drop below 20 mK which points to long-range antiferromagnetic order at low temperatures. The s.c. magnetization curves studied in the capacitive torque meter do not show any sign of the internal phase lines but a crossing line parallel to Bc2(T), similar to the peak effect. This behavior is interpreted in terms of anisotropic flux pinning.

Original languageEnglish
Pages (from-to)672-673
Number of pages2
JournalPhysica B: Condensed Matter
StatePublished - 1999
Externally publishedYes


  • Heavy fermion system
  • Magnetization
  • Superconductivity


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