Abstract

The authors measured the remanent magnetization of superconducting NbTi and MgB2 as a function of time after removing an applied field. At similar reduced temperatures, the density of magnetic flux quanta (fluxons) is found to relax faster in NbTi than in MgB2. Nearer the transition, the relaxation rate in both materials exhibits a saturation that is independent of the initially applied field. This saturation occurs when the distance between fluxons is comparable to the London penetration depth. The temperature dependence of the saturation and time dependence of the relaxation can be characterized by the Anderson-Kim model [Rev. Mod. Phys. 36, 39 (1964)] for fluxon dynamics.

Original languageEnglish (US)
Article number132504
JournalApplied Physics Letters
Volume90
Issue number13
DOIs
StatePublished - 2007

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saturation
time dependence
magnetic flux
penetration
magnetization
temperature dependence
temperature

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Saturation and intrinsic dynamics of fluxons in NbTi and MgB2 . / Chamberlin, Ralph; Newman, Nathan; Gandikota, R.; Singh, Rakesh; Moeckly, B. H.

In: Applied Physics Letters, Vol. 90, No. 13, 132504, 2007.

Research output: Contribution to journalArticle

Chamberlin, Ralph ; Newman, Nathan ; Gandikota, R. ; Singh, Rakesh ; Moeckly, B. H. / Saturation and intrinsic dynamics of fluxons in NbTi and MgB2 In: Applied Physics Letters. 2007 ; Vol. 90, No. 13.
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