Plastic Properties of Solid 4He Probed by a Moving Wire: Viscoelastic and Stochastic Behavior Under High Stress

Plastic Properties of Solid 4He Probed by a Moving Wire: Viscoelastic and Stochastic Behavior Under High Stress
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通过移动导线探测固体 4He 的塑性特性:高应力下的粘弹性和随机行为

DOI:
10.1007/s10909-013-0922-6
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发表时间:
2013
影响因子:
2
通讯作者:
Ahlstrom S
Ahlstrom S
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Ahlstrom S

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我们目前的测量细导线通过solid4He移动。在接近熔化曲线的压力下,在很宽的温度范围内进行测量。我们描述了新的实验技术,并提出了在相对较高的驱动力(应力)和速度(应变率)的初步测量。金属丝的移动是通过空位的量子隧穿和缺陷的运动来促进周围固体的塑性变形。在体心立方相,我们观察到非常明显的粘弹性效应与弛豫时间跨越几个数量级。在hcp阶段,我们观察到随机的阶梯状运动的金属丝。在该步骤期间,金属丝可以以极高的速度移动。在冷却时,金属丝在约1K的温度下停止移动。我们无法在低于10 mK的低温下检测到任何运动。
We present measurements of a thin wire moving through solid4He. Measurements were made over a wide temperature range at pressures close to the melting curve. We describe the new experimental technique and present preliminary measurements at relatively high driving forces (stresses) and velocities (strain rates). The wire moves by plastic deformation of the surrounding solid facilitated by quantum tunneling of vacancies and the motion of defects. In the bcc phase we observe very pronounced viscoelastic effects with relaxation times spanning several orders of magnitude. In the hcp phase we observe stochastic step-like motion of the wire. During the step, the wire can move at extremely high velocities. On cooling, the wire ceases to move at a temperature of around 1 K. We are unable to detect any motion at lower temperatures, down to below 10 mK.
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发表时间: 2013-01-14
影响因子: 8.6
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