Magnetic study of the UPt3 superconducting phases

Stephan Schöttl, Erwin A. Schuberth*, Jan B. Kycia, William P Halperin

*Corresponding author for this work

Research output: Contribution to journalConference article

Abstract

In order to distinguish the UPt3 superconducting (s.c.) phases we have studied their magnetic properties at low fields in a SQUID magnetometer and up to fields > Hc2(0) with a capacitive torque-meter. With the SQUID we measure the magnetic penetration depth and find the second s.c. transition at Tc - when the field is applied along the c-axis, but not with H⊥ĉ. This result, combined with power-law behavior at low temperature T, is most consistent with the two-dimensional E2u s.c. order parameter. Below 20 mK we find an additional diamagnetic signal that we ascribe to the normal state magnetism. In high fields our torque measurements show a kink of the perpendicular magnetization component at the B-C phase line, pointing to an enhanced Ginzburg-Landau parameter in the C phase.

Original languageEnglish (US)
Pages (from-to)174-175
Number of pages2
JournalPhysica B: Condensed Matter
Volume280
Issue number1-4
DOIs
StatePublished - Jan 1 2000
Event22nd International Conference on Low Temperature Physics (LT-22) - Helsinki, Finl
Duration: Aug 4 1999Aug 11 1999

Keywords

  • Heavy fermions
  • Penetration depth
  • Torque measurement
  • UPt

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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