Hysteretic behavior of the vortex lattice at the onset of the second peak for the HgBa2CuO4+δ superconductor
D. Stamopoulos, M. Pissas
DOI 10.1103/PhysRevB.65.134524 · Physical Review B
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Abstract
By means of local Hall probe ac and dc permeability measurements, we investigate the phase diagram of vortex matter for the HgBa2CuO4+δ superconductor in the regime near critical temperature. The second peak line Hsp, in contrast to what is usually assumed, does not terminate at the critical temperature. Our local ac permeability measurements reveal a pronounced hysteretic behavior and thermomagnetic history effects near the onset of the second peak, giving evidence of a phase transition of vortex matter from an ordered qausilattice state to a disordered glass.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 89.9 | Pressure not reported | onset |
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