Vortex avalanches in the non-centrosymmetric superconductor Li2Pt3B

Details Vortex avalanches in the non-centrosymmetric superconductor Li2Pt3B Vortex avalanches in the non-centrosymmetric superconductor Li2Pt3B

2008-08-18

arxiv.org/abs/0808.2498v1

Phys. Rev. B 80, 132502 (2009)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.80.132502

We investigated the vortex dynamics in the non-centrosymmetric superconductor Li_2Pt_3B in the temperature range 0.1 K - 2.8 K. Two different logarithmic creep regimes in the decay of the remanent magnetization from the Bean critical state have been observed. In the first regime, the creep rate is extraordinarily small, indicating the existence of a new, very effective pinning mechanism. At a certain time a vortex avalanche occurs that increases the logarithmic creep rate by a factor of about 5 to 10 depending on the temperature. This may indicate that certain barriers against flux motion are present and they can be opened under increased pressure exerted by the vortices. A possible mechanism based on the barrier effect of twin boundaries is briefly discussed.

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