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We investigated the magnetism and superconductivity in as-sintered (AS) andoxidation annealed (OA) T*-type La$_{1-x/2}$Eu$_{1-x/2}$Sr$_x$CuO$_4$ (LESCO)with 0.14 $\leq x \leq$ 0.28 by the first comprehensive muon spinrotation/relaxation ($\mu$SR), magnetic susceptibility, and electricalresistivity measurements. In OA superconducting samples, no evidence ofmagnetic order was observed, whereas AS semiconducting samples exhibitedevidence of a disordered magnetic state in the measured temperature rangebetween $\sim$4 K and $\sim$8 K. Therefore, the ground state in LESCOdrastically varies with oxidation annealing and the magnetic phasecompetitively exists with the superconducting (SC) phase. The magnetic phase inthe AS LESCO is quite robust against Sr doping, while the SC phase degradeswith increasing $x$. A monotonous decrease of the SC transition temperaturefrom 24.5 K in $x$ = 0.14 to 9.0 K in $x$ = 0.28 suggests the disappearance ofthe SC phase at $x$ $\sim$ 0.34. Furthermore, we clarified the simultaneousdevelopment of (quasi) static magnetism and the electrical resistivity at a lowtemperature in AS samples, suggesting the inducement of magnetism by thesuppression of carrier mobility. The variation in magnetism due to annealing isdiscussed from a viewpoint of structural defects, which was previously reportedfrom neutron diffraction measurements.

journal of the physical society of japan

Oxidation annealing effects on the spin-glass-like magnetism and  appearance of superconductivity in T*-type  La$_{1-x/2}$Eu$_{1-x/2}$Sr$_x$CuO$_4$ (0.14 $\leq x \leq$ 0.28)