Abstract
Hydrogenated powdered ${\mathrm{H}}_{\mathit{z}}$${\mathrm{La}}_{2\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Sr}}_{\mathit{x}}$Cu(Fe)${\mathrm{O}}_{4}$ was studied by means of M\"ossbauer spectroscopy, magnetic ac susceptibility, and x-ray powder diffraction. We have shown that hydrogenation of ${\mathrm{La}}_{2\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Sr}}_{\mathit{x}}$${\mathrm{CuO}}_{4}$ leads to a decrease of charge carrier concentration. Low-temperature (T280 K) M\"ossbauer spectra of highly hydrogenated ${\mathrm{H}}_{\mathit{z}}$${\mathrm{La}}_{2\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Sr}}_{\mathit{x}}$Cu(Fe)${\mathrm{O}}_{4}$ samples exhibit the presence of magnetic and nonmagnetic parts. We interpret this as being due to phase separation into magnetic insulating and metallic regions, taking place slightly below room temperature.
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