Physics – Condensed Matter – Superconductivity
Scientific paper
2008-07-19
Phys. Rev. B 78, 144512 (2008)
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1103/PhysRevB.78.144512
We have measured small-amplitude rf penetration depth $\lambda(H,T)$ in pure and C, Li and (Li+C) doped single crystals of MgB$_2$. The effect of doping on the critical temperature T$_c$ and on the upper critical field H$_{c2}$ was found to be in good agreement with previous results. We report the presence of clear signatures of irreversibility in $\lambda(H,T)$, associated with the peak effect. Carbon doping enhances the signature and shifts its position on the H-T phase diagram to higher temperatures. Contrary to this, Li substitution has the effect of suppressing the peak effect to lower temperatures. Analysis of both zero field (ZFC) and field cooled (FC) measurements suggests that the hysteresis associated with the peak effect is due to macroscopic screening supercurrents, $j$, generated during the magnetic field ramp.
Gordon R. T.
Karpinski Janusz
Martin Chris
Prozorov Ruslan
Vannette Matthew D.
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