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We present experimental results for the in-plane resistivity of theelectron-doped cuprate superconductor $La_{2-x}Ce_xCuO_4$ above its transitiontemperature $T_c$ as a function of Ce doping x and temperature. For the dopingx between 0.11 and 0.17, where $T_c$ varies from 30 K (x=0.11) to 5 K (x=0.17),we find that the resistivity shows an approximate $T^2$ behavior for all valuesof doping over the measurement range from 100 K to 400 K. The coefficient ofthe $T^2$ resistivity term decreases with increasing x following the trend in$T_c$. We analyze our data theoretically and posit that n-type cuprates arebetter thought of as strange metals. Although the quadratic temperaturedependence appears to be in naive agreement with the Fermi liquid (FL)expectations, the fact that the measured resistivity is large and nophonon-induced linear-in-T resistivity manifests itself even at 400 K argueagainst a standard normal metal Fermi liquid picture being applicable. Wediscuss possible origins of the strange metal behavior.

Anomalous normal state resistivity in superconducting $La_{2-x}Ce_xCuO_4$: Fermi liquid or strange metal?