Spin-state transition in Pr 0.5Ca 0.5CoO 3 analyzed by x-ray absorption and emission spectroscopies

Abstract

We present a study of the Co spin-state changes in Pr 0.5Ca 0.5CoO 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 Kβ 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. © 2012 American Physical Society.