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Magnetothermal instabilities in an organic superconductor

机译:有机超导体中的磁热不稳定性

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摘要

We have studied the occurrence of magnetothermal instabilities in a κ-(BEDT-TTF)_2Cu[N(CN)_2]Br single crystal during field sweep magnetization experiments, equivalent to short time relaxation studies. We find instability behaviour in good agreement with a recent model by Mints, for a non-linear E(J) characteristic. In particular, we find that a decrease of the dynamic relaxation rate, characterizing the effective activation energy, precedes the unstable regime. We point out formal analogies between such instabilities and the general predictions for flux avalanches.
机译:我们已经研究了在场扫描磁化实验中κ-(BEDT-TTF)_2Cu [N(CN)_2] Br单晶中磁热不稳定性的发生,这等效于短时弛豫研究。对于非线性E(J)特征,我们发现不稳定行为与Mints的最新模型非常吻合。特别地,我们发现动态弛豫速率的降低是表征有效活化能的先于不稳定状态。我们指出了这种不稳定性与通量雪崩的一般预测之间的形式类比。

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