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Local electronic structure and magnetic properties of double-perovskite LaCo0.5Ni0.5O3 and PrCo0.5Ni0.5O3

Meng-Jie Huang1,2,*, Peter Nagel1,3, Andreas Eich1, Michael Merz1,3, and Stefan Schuppler1,3

  • *Contact author: meng-jie.huang@desy.de
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Phys. Rev. B 113, 035131 – Published 16 January, 2026

DOI: https://doi.org/10.1103/7j4m-g6nh

Abstract

With x-ray absorption spectroscopy and x-ray magnetic circular dichroism, the element-specific electronic structure and the magnetic interactions of the double perovskite compounds PrCo0.5Ni0.5O3 and LaCo0.5Ni0.5O3 were studied. In both compounds, Co and Ni depart from their nominal valence state of +3, implying a charge transfer from Ni to Co. XMCD measurements clearly reveal a ferromagnetic behavior of Co and Ni in both samples. The substitution of La by Pr is isovalent but leads to a partial spin-state transition of Co3+ from high spin to low spin, resulting in a significant decrease in the magnetic moment of Co. Furthermore, a magnetic moment is found on the Pr site as well, with the Pr spin moment oriented antiparallel to those of Co and Ni. This antiferromagnetic coupling is induced by the superexchange interaction between the Pr 4f and Co/Ni 3d states.

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Phys. Rev. B 113, 035131– Published 16 January, 2026
  • Received 9 September 2024
  • Revised 11 November 2025
  • Accepted 5 January 2026
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