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Non-Gaussian noise in the in-plane transport of lightly doped La<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mi mathvariant="bold-italic">2</mml:mi><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>Sr<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mi mathvariant="bold-italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow…
A study of the in-plane resistance noise on a high-quality single crystal of La${}_{1.97}$Sr${}_{0.03}$CuO${}_{4}$ deep inside the spin-glass phase reveals the onset of non-Gaussianity and the insensitivity of the noise to the in-plane magnetic field. The results indicate that the charge dynamics become increasingly slow and correlated as temperature $T\ensuremath{\rightarrow}0$. …