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The microscopic details of flux line lattice state studied by muon spinrotation is reported in an electron-doped high-$T_{\rm c}$ cupratesuperconductor, Sr$_{1-x}$La$_{x}$CuO$_{2}$ (SLCO, $x=0.10$--0.15). A clearsign of phase separation between magnetic and non-magnetic phases is observed,where the effective magnetic penetration depth [$\lambda\equiv\lambda(T,H)$] isdetermined selectively for the latter phase. The extremely small value of$\lambda(0,0)$ %versus $T_{\rm c}$ and corresponding large superfluid density($n_s \propto \lambda^{-2}$) is consistent with presence of a large Fermisurface with carrier density of $1+x$, which suggests the breakdown of the"doped Mott insulator" even at the "optimal doping" in SLCO. Moreover, arelatively weak anisotropy in the superconducting order parameter is suggestedby the field dependence of $\lambda(0,H)$. These observations strongly suggestthat the superconductivity in SLCO is of a different class from hole-dopedcuprates.

Flux line lattice state versus magnetism in electron-doped cuprate superconductor Sr_{1-x}La_{x}CuO_{2}