Local magnetization fluctuations in superconducting glasses resolved by Hall sensors

J. Lefebvre, M. Hilke, Z. Altounian, K. W. West, L. N. Pfeiffer

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


We report on magnetization measurements performed on a series of Fex Ni1-x Zr2 superconducting metallic glasses with 0≤x≤0.5 using the Hall effect of a nearby two-dimensional electron gas (2DEG) in a GaAs/ Al0.33 Ga0.67 As heterostructure as a local probe. The great sensitivity of the Hall effect of the 2DEG in such heterostructure is exploited to determine the magnetization of the superconductor due to the Meissner effect and flux trapping. The data are used to determine the lower critical-field Bc1 of the superconductors as a function of temperature. Surprisingly large fluctuations in the magnetization are also observed and attributed to the presence of large flux clusters in the superconductor.

Original languageEnglish (US)
Article number184524
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number18
StatePublished - May 1 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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