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Magnetic flux noise in MgB2 superconductor

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3 Author(s)
Khare, Neeraj ; Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India ; Singh, D.P. ; Gupta, Ajai K.

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Magnetic flux noise in MgB2 polycrystalline sample is measured using a high-TC rf-superconducting quantum interference device in the temperature range of 6–40 K. A small magnetic field (∼200 mG) was applied while cooling the sample. The flux noise exhibits 1/fα type of behavior with α∼1.0–1.3 and shows enhanced noise around 24 and 37 K. The flux noise seems to originate from thermally activated vortex hopping. The large magnetic noise at 24 K indicates the presence of larger density of pinning sites with energies ∼0.061 eV leading to enhanced magnetic fluctuations at temperatures much below TC.

Published in:

Applied Physics Letters  (Volume:92 ,  Issue: 19 )