We have investigated the temperature-dependent changes in the near-EF occupied and unoccupied states of Pr0.67Ca0.33MnO3 which shows the presence of ferromagnetic and antiferromagnetic phases. The temperature-dependent changes in the charge and orbital degrees of freedom and associated changes in the Mn 3d–O 2p hybridization result in varied O 2p contributions to the valence band. A quantitative estimate of the charge transfer energy (ECT) shows a larger value compared to the earlier reported estimates. The charge localization causing the large ECT is discussed in terms of different models including the electronic phase separation.
Electronic structure of Pr0.67Ca0.33MnO3 near the Fermi level studied by ultraviolet photoelectron and x-ray absorption spectroscopy / M., Dalai; P., Pal; B., Sekhar; N., Saini; R., Singhal; K., Garg; B., Doyle; Nannarone, Stefano; C., Martin; F., Studer. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - STAMPA. - 74:(2006), pp. 165119-6 pagine-165119-6 pagine. [10.1103/PhysRevB.74.165119]
Electronic structure of Pr0.67Ca0.33MnO3 near the Fermi level studied by ultraviolet photoelectron and x-ray absorption spectroscopy
NANNARONE, Stefano;
2006
Abstract
We have investigated the temperature-dependent changes in the near-EF occupied and unoccupied states of Pr0.67Ca0.33MnO3 which shows the presence of ferromagnetic and antiferromagnetic phases. The temperature-dependent changes in the charge and orbital degrees of freedom and associated changes in the Mn 3d–O 2p hybridization result in varied O 2p contributions to the valence band. A quantitative estimate of the charge transfer energy (ECT) shows a larger value compared to the earlier reported estimates. The charge localization causing the large ECT is discussed in terms of different models including the electronic phase separation.
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