No Ending Point in The Bragg-to-Vortex Glass Phase Transition Line at Low Temperatures

Details No Ending Point in The Bragg-to-Vortex Glass Phase Transition Line at Low Temperatures No Ending Point in The Bragg-to-Vortex Glass Phase Transition Line at Low Temperatures

2001-08-31

arxiv.org/abs/cond-mat/0108534v2

Physical Review B 65, 214515 (2002)

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures

Scientific paper

10.1103/PhysRevB.65.214515

We have measured the magnetic hysteresis loops and the magnetic relaxation for $Bi_2Sr_2CaCu_2O_{8+\delta}$ (Bi-2212) single crystals which exhibit the second magnetization peak effect. Although no second peak effect is observed below 20 K in the measurement with fast field sweeping rate, it is found that the second peak effect will appear again after long time relaxation or in a measurement with very slow field sweeping rate at 16 K. It is anticipated that the peak effect will appear at very low temperatures (approaching zero K) when the relaxation time is long enough. We attribute this phenomenon to the profile of the interior magnetic field and conclude that the phase transition line of Bragg glass to vortex glass has no ending point at low temperatures.

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