论文标题
超导涡流系统中的干扰，脆弱和固定现象
Jamming, Fragility and Pinning Phenomena in Superconducting Vortex Systems
论文作者
论文摘要
我们检查了驱动的超导涡流与淬灭疾病相互作用，在这些旋转中，我们在垂直于垂直的驱动脉冲序列下测量记忆效应。作为无序强度的函数，我们发现了四种类型的行为：弹性反应，脆弱的相位，堵塞相位和固定的统治状态。这些阶段可以通过存在或不存在不同类型的记忆效应来区分。脆弱的状态表现出记忆，而弹性和固定的统治权则没有。在脆弱的制度中，系统在第一个驱动脉冲期间组织到固定状态，在垂直方向上应用的第二个驱动脉冲中流动，然后在第三个驱动脉冲中返回到固定状态，该脉冲沿着与第一个脉冲相同的方向应用。这种行为是Cates等人在颗粒物中堵塞的脆弱性标志。 [物理。莱特牧师。 81，1841（1998）]。对于更强的疾病，我们观察到一种强大的干扰状态，其中仍然存在记忆效应，但是该系统在垂直驱动脉冲期间达到了固定或降低的流量状态，类似于剪切干扰下的颗粒系统中出现的流量。我们表明，不同状态在空间涡流配置中产生签名，并由弹性组件的共存和涡流组件中的固定组件共存产生内存效应。我们提出的顺序垂直驱动方案是为了区分脆弱，堵塞和固定的相位，应在存在淬灭疾病的情况下通常是更广泛的驱动相互作用颗粒。
We examine driven superconducting vortices interacting with quenched disorder where we measure the memory effects under a sequence of drive pulses applied perpendicular to each other. As a function of disorder strength, we find four types of behavior: an elastic response, a fragile phase, a jammed phase, and a pinning dominated regime. These phases can be distinguished by the presence or absence of different types of memory effects. The fragile and jammed states exhibit memory, while the elastic and pinning dominated regimes do not. In the fragile regime, the system organizes into a pinned state during the first drive pulse, flows during the second drive pulse which is applied in the perpendicular direction, and then returns to a pinned state during the third drive pulse which is applied in the same direction as the first pulse. This behavior is the hallmark of fragility that has been proposed for jamming in particulate matter by Cates et al. [Phys. Rev. Lett. 81, 1841 (1998)]. For stronger disorder, we observe a robust jamming state in which a memory effect is still present but the system reaches a pinned or reduced flow state during the perpendicular drive pulse, similar to what appears in granular systems under shear jamming. We show that the different states produce signatures in the spatial vortex configurations, with memory effects arising from the coexistence of an elastic component and a pinned component in the vortex assembly. The sequential perpendicular driving protocol we propose for distinguishing fragile, jammed, and pinned phases should be general to the broader class of driven interacting particles in the presence of quenched disorder.
