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

Abstract

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, $H_{\mathrm{sp}}$, 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.

References in corpus (4)

• Inverse melting of the vortex lattice
• A Bragg glass phase in the vortex lattice of a type II superconductor
• Peak effect, vortex-lattice melting-line and order - disorder transition in conventional and high-T superconductors
• Oscillatory dynamics and organization of the vortex solid in YBa2Cu3O7 single crystals

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• Vortex phases and glassy dynamics in the highly anisotropic superconductor HgBa${}_2$CuO${}_{4+\delta }$
• Relaxation measurements in the regime of the second magnetization peak in Nb films
• Vortex phase diagram and temperature-dependent second-peak effect in overdoped Bi${}_2$Sr${}_2$CuO${}_{6+\delta }$ crystals
• Three Magnetization Peaks in HgBa${}_2$Ca${}_2$Cu${}_3$O${}_8$ Single Crystals