Abstract
The mechanisms driving the phase separation in high-T c La cuprates is studied by magnetic susceptibility and electrical resistivity measurements. The experiments are performed under different thermal treatment. Three temperature ranges can be resolved characteristic for different physical processes: At 150≦T≦170K a space limited diffusion of superparamagnetic clusters (single hole clusters) occurs leading to the formation of a small but rather tight percolative subphase which at highT c values becomes superconducting. Above 180 K the cluster motion becomes unrestricted in space and a more extended subphase is built up, however, with lowerT c values. Above ≈ 230 K oxygen diffusion starts leading to an unexpected destruction of the conducting/superconducting phase.
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Kremer, R.K., Hizhnyakov, V., Sigmund, E. et al. Electronic phase separation in La-Cuprates. Z. Physik B - Condensed Matter 91, 169–174 (1993). https://doi.org/10.1007/BF01315232
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DOI: https://doi.org/10.1007/BF01315232