Spin-state transition in Pr0.5Ca0.5CoO3 analyzed by x-ray absorption and emission spectroscopies

We present a study of the Co spin-state changes in Pr0.5Ca0.5CoO3 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,L-3 absorption spectra, in combination with Co K beta main emission lines, indicate that Co3+ 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.