Abstract
We present a study of the Co spin-state changes in Pr${}_{0.5}$Ca${}_{0.5}$CoO${}_{3}$ across the metal-insulator transition by means of the analysis of two complementary synchrotron x-ray spectroscopic techniques. Recorded experimental and charge transfer multiplet--based calculated Co ${L}_{2,3}$ absorption spectra, in combination with Co $K$\ensuremath{\beta} main emission lines, indicate that Co${}^{3+}$ ion spin state evolves from low in the insulating phase to a low:high mixed state in the metallic regime, close to a 1:1 ratio at ambient temperature. A pure high spin state can be discarded, while the occurrence of an intermediate state is also questioned.
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