当前位置: X-MOL 学术Physica A › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Brownian dynamics study of driven partially pinned solid in the presence of square array of pinning centers: Enhanced pinning close to the melting transition
Physica A: Statistical Mechanics and its Applications ( IF 3.3 ) Pub Date : 2020-05-27 , DOI: 10.1016/j.physa.2020.124737
Toby Joseph

A set of interacting vortices in 2D in the presence of a substrate with square symmetry and at filling ratio 1 can display a low temperature solid phase where only one of the reciprocal lattice vectors of the substrate is present (Joseph and Dasgupta, 2002), (Fasano et al., 2003). This partially pinned vortex lattice melts to a modulated liquid via a continuous transition (Joseph and Dasgupta, 2002). Brownian dynamics simulation is carried out to study the behavior of driven partially pinned solid at different temperatures. The average vortex velocity for forces above the depinning threshold shows a non-monotonic behavior with temperature, with a minimum in the average velocity close to the melting point. This is reminiscent of the peak effect seen in vortex systems with random disorder. This effect in the current system can be qualitatively explained by an effective increase in the barriers encountered by the particles as Tc is approached. Approximate calculation of the energy barriers as a function of temperature, from the simulation, supports this claim.



中文翻译:

在钉扎中心呈方形排列的情况下,部分钉扎的固体的布朗动力学研究:接近熔融转变的钉扎增强

一组相互作用的涡流 2d在存在方形对称且填充比为1的底物的情况下,可以显示低温固相,其中仅存在底物的倒数晶格矢量之一(Joseph and Dasgupta,2002),(Fasano et al。,2003) 。这种部分固定的涡旋晶格通过连续过渡转变为调制后的液体(Joseph和Dasgupta,2002)。进行了布朗动力学仿真,以研究在不同温度下被驱动的部分固定固体的行为。高于固定销阈值的力的平均涡旋速度显示出随温度的非单调性,平均速度在接近熔点时最小。这使人想起在具有随机障碍的涡流系统中看到的峰值效应。ŤC接近。通过仿真对能垒作为温度的函数进行的近似计算支持了这一主张。

更新日期:2020-05-27
down
wechat
bug