Effect of field dependent core size on reversible magnetization of high-$κ$ superconductors

Details Effect of field dependent core size on reversible magnetization of high-$κ$ superconductors Effect of field dependent core size on reversible magnetization of high-$κ$ superconductors

2006-06-21

arxiv.org/abs/cond-mat/0606562v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.74.184521

The field dependence of the vortex core size $\xi(B)$ is incorporated in the London model, in order to describe reversible magnetization $M(B,T)$ for a number of materials with large Ginzburg-Landau parameter $\kappa$. The dependence $\xi(B)$ is directly related to deviations in $M(\ln B)$ from linear behavior prescribed by the standard London model. A simple method to extract $\xi(B)$ from the magnetization data is proposed. For most materials examined, $\xi(B)$ so obtained decreases with increasing field and is in qualitative agreement both with behavior extracted from $\mu$SR and small angle neutron scattering data and with that predicted theoretically.

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