Evidence for Correlated Dynamics near the Berezinskii-Kosterlitz-Thouless-like Transition in Highly Underdoped La${}_{2-x}$Sr${}_x$CuO${}_4$

Zhenzhong Shi, Xiaoyan Shi, Dragana Popović

A low-frequency resistance noise study in highly underdoped thick films of La${}_{2-x}$Sr${}_x$CuO${}_4$ ($x=0.07$ and 0.08) reveals slow, correlated dynamics and breaking of ergodic…