Paramagnetic relaxation and wohlleben effect in field-cooled nb thin films

A. Terentiev, D. B. Watkins, L. E. De Long

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

The “Wohlleben effect” (paramagnetic Meissner effect) is found in uniform applied magnetic fields only above a threshold value (Formula presented) for field-cooled Nb films of thickness less than 1000 Å. The initial diamagnetic magnetization observed upon field cooling to fixed temperatures just below (Formula presented) gives way to a logarithmic time relaxation toward paramagnetic values comparable to the critical state magnetization over a period of several hours (normalized rate (Formula presented) implying that the development of the paramagnetic state is moderated by fast flux creep processes. Small field gradients ≈10–20 mOe/cm are found to influence the occurrence of the effect for applied fields (Formula presented)

Original languageEnglish
Pages (from-to)R761-R764
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume60
Issue number2
DOIs
StatePublished - 1999

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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