Glassy effects in magnetotransport in La$_{1.97}$Sr$_{0.03}$CuO$_4$ thin films

We have studied the in-plane magnetoresistance (MR) in atomically smooth, MBE grown La$_{1.97}$Sr$_{0.03}$CuO$_4$ thin films. The MR was measured at temperatures between 0.6~K and 8~K and in $B$ up to 9~T, both parallel and perpendicular to the $c$-axis. The MR exhibits strong dependence on magnetic field history, such as hysteresis and memory at low $T$, similar to the results on $c$-axis transport in single crystal samples [1]. Here, however, the difference between field-cooled and zero-field cooled MR vanishes above $T \sim$ 5~K, independent of the magnitude and orientation of $B$. Low $T$ resistance noise measurements also will be discussed. The results suggest that the glassiness observed in the films may also originate from the slow charge dynamics at low temperatures. [1] I. Rai\v{c}evi\'c, \emph{et. al.}, PRL \textbf{101}, 177004 (2008).