DC magnetic penetration depth of UPt3and Sr2RuO 4: Implications for the superconducting order parameters

Erwin A. Schuberth, Stephan Schöttl, Karol Flachbart, Takahiko Sasaki

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)372-373
Number of pages2
JournalJournal of Magnetism and Magnetic Materials
Volume226-230
Issue numberPART I
DOIs
Publication statusPublished - 2001 Jan 1

Keywords

  • Heavy-fermion systems
  • SQUID magnetization
  • Superconducting penetration depth
  • Superconductivity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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