Hysteretic behavior of the vortex lattice at the onset of the second peak for HgBa$_2$CuO$_{4+δ}$ superconductor

Details Hysteretic behavior of the vortex lattice at the onset of the second peak for HgBa$_2$CuO$_{4+δ}$ superconductor Hysteretic behavior of the vortex lattice at the onset of the second peak for HgBa$_2$CuO$_{4+δ}$ superconductor

2001-10-22

arxiv.org/abs/cond-mat/0110468v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.65.134524

By means of local Hall probe ac and dc permeability measurements we investigated the phase diagram of vortex matter for the HgBa$_2$CuO$_{4+\delta }$ superconductor in the regime near the critical temperature. The second peak line, $H_{\rm sp}$, in contrast to what is usually assumed, doesn't terminate at the critical temperature. Our local ac permeability measurements revealed pronounced hysteretic behavior and thermomagnetic history effects near the onset of the second peak, giving evidence for a phase transition of vortex matter from an ordered qausilattice state to a disordered glass.

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