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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.We are thankful for financial support from MICINN (Spanish government) under projects MAT2009-09308, NANOSELECT under Project No. CSD2007-00041, and the ESRF and BESSY for the provision of beamtime. The research leading to these results has received funding from the European Community’s Seventh Framework Program (FP/2007-2013) under Grant No. 226716. J.H.-M. also thanks CSIC for the JAEdoc contract, cofinanced by the European Social Fund.Peer Reviewe

physical review b

Spin-state transition in Pr<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub></mml:math>Ca<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub></mml:math>CoO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>analyzed by x…

Spin-state transition in Pr0.5Ca0.5CoO3analyzed by x…