Zeitschrift für Physik B Condensed Matter

Percolative phase separation in La2CuO4+δ and La2-xSrxCuO4

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We report on the formation of conducting phases in slightly doped La2CuO4 samples by the existence of a percolative phase separation. Phase separation can be quenched by rapid cooling and can be restored by the application of a 3 T magnetic field. Magnetically polarizable quasiparticles are shown to be formed by hole doping which fuse to form percolative conducting and below 37 K superconducting phases. © 1992 Springer-Verlag.