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

physical review. b, condensed matter

Hysteretic behavior of the vortex lattice at the onset of the second peak for the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">HgBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>…

Hysteretic behavior of the vortex lattice at the onset of the second peak for theHgBa2CuO4+δ…