单轴超导体中倾斜涡旋晶格冷却引起的热蠕变
Thermal creep emerging from cooling a tilted vortex lattice in uniaxial superconductor
摘要：
一个受扰动的系统向一个平衡态松弛，这个平衡态由势能图景中的一个最小值给出。这通常是通过热激活的亚稳态跃迁发生的。相应的动力学称为蠕变，并遵循阿耳忒弥斯定律。这里我们考虑平衡位置取决于温度的情况。我们发现，这种效应发生在各向异性超导体$2\mathrm{H}$ - $\mathrm{Nb}\mathrm{Se}_{2}$的涡旋晶格时，磁场是倾斜远离主轴，它导致的蠕变时，冷却样品的特殊外观。温度决定系统的基态，同时又使系统回到平衡状态，起着双重的、对立的作用。我们预计，冷却诱导蠕变发生在相关系统中，具有许多自由度，允许通过热处理来调整平衡态。
英文摘要：
A perturbed system relaxes towards an equilibrium given by a minimum in the potential energy landscape. This often occurs by thermally activated jumps over metastable states. The corresponding dynamics is named creep and follows Arrhenius' law. Here we consider the situation where the equilibrium position depends on temperature. We show that this effect occurs in the vortex lattice of the anisotropic superconductor $2\mathrm{H}$-$\mathrm{Nb}\mathrm{Se}_{2}$ when the magnetic field is tilted away from the principal axes, and that it leads to the peculiar appearance of creep when cooling the sample. Temperature determines the system's ground state and at the same time brings the system back to equilibrium, playing a dual and antagonistic role. We expect that cooling induced creep occurs in correlated systems with many degrees of freedom allowing to tune the equilibrium state via heat treatment.
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