Kunchur M N, Ivlev B I, Knight J M
Department of Physics and Astronomy, University of South Carolina, Columbia, South Carolina 29208, USA.
Phys Rev Lett. 2001 Oct 22;87(17):177001. doi: 10.1103/PhysRevLett.87.177001. Epub 2001 Oct 3.
Current-voltage characteristics were measured in the mixed state of Y(1)Ba(2)Cu(3)O(7-delta) superconducting films in the regime where flux flow becomes unstable and the differential conductivity dj/dE becomes negative. Under conditions where its negative slope is steep, the j(E) curve develops a pronounced staircase-like pattern. We attribute the steps in j(E) to the formation of a dynamical phase consisting of the successive nucleation of quantized distortions in the local vortex velocity and flux distribution within the moving flux matter.
在Y(1)Ba(2)Cu(3)O(7-δ)超导薄膜的混合态下，测量了电流-电压特性，该混合态处于磁通流动变得不稳定且微分电导率dj/dE变为负值的区域。在其负斜率陡峭的条件下，j(E)曲线呈现出明显的阶梯状图案。我们将j(E)中的台阶归因于一个动态相的形成，该动态相由移动磁通物质中局部涡旋速度和磁通分布的量子化畸变的连续成核组成。
