Abstract
We have studied the temperature-dependent changes in the near electronic structure of the electron-doped, phase separated colossal magnetoresistance (CMR) compound, CaPrMnO using photoemission and x-ray absorption studies. At low temperatures, this compound shows a high electron density near the though the compound is insulating. Photoemission measurements further showed a temperature dependence of the electron occupation and localization while the complementary results of XAS showed corresponding changes in the number of unoccupied states. Our results indicate a transfer of charges from the states to the band, probably due to a decrease in the crystal field splitting in the ferromagnetic metallic (FMM) phase following the structural changes of the MnO octahedra at low temperatures. We have interpreted our results from a FMM-antiferromagnetic insulating (AFMI) phase separation scenario.
- Received 1 March 2011
DOI:https://doi.org/10.1103/PhysRevB.85.155128
©2012 American Physical Society